14 Although there was no objection to the tender of the statement of facts the sentencing judge was informed that not all of the facts were agreed. The facts in dispute were not further identified. They were not identified on the appeal. The finding under challenge on the appeal was not reflected in the statement of facts. I assume, however, that the prosecutor made it clear before the sentence proceedings that he intended to attribute to Mr Mangan the principal role in the joint enterprise and to prove that the assault was committed at his instigation by prearrangement with others, including Mr Duffy. It is not apparent how he proposed to prove those matters given that the statement of facts was silent on the issue.
15 The applicant gave evidence that the attack he launched on the victim was not premeditated. He said that he lost his temper when he came upon the victim by chance having received information that his mother (the victim's de facto partner) was at the hospital near her home hiding after an argument with the victim. He denied soliciting the assistance of his friends, including Mr Duffy, to seek out the victim with the intention of punishing him in retaliation or retribution at his mother's mistreatment. He gave evidence that when he saw the victim on the street he became angry because the victim looked unconcerned when he knew his mother was hiding at the hospital in fear. He claimed he got out of the car with the piece of wood for protection, but also agreed with the proposition, put by his legal representative, that the attack he launched almost immediately thereafter was "fairly brutal and savage". He said he believed at the time that the attack was justified, something that he only appreciated was misplaced a year or so after the event when reflecting upon his conduct and the injuries he had inflicted upon the victim.
16 The applicant refused to concede in cross-examination that he was in company with Mr Duffy, his girlfriend and Mr Henderson at the time the offence was committed because of the back-up they might have been called upon to provide in the event that he was successful in finding the victim. The prosecutor sought that concession by reading verbatim from Mr Henderson's statement to police. The applicant also expressly denied in cross-examination saying to Mr Duffy, "Can you come with me because I'm going to fight him or hit him. Can you give me a hand if I get stuck". This was something that the prosecutor informed the applicant Mr Duffy had told police in his record of interview. I note that the prosecutor also took the applicant to evidence Mr Duffy gave in his sentence proceedings before the sentencing judge the previous day when he deposed to the fact that the applicant had the piece of wood that he used to assault the victim in his lap as they drove around looking for the victim. Mr Mangan denied this was the case. He claimed that the wood was something he used to prop up the boot of his car on occasions, and that he only reached into the back seat for it when he saw the victim walking on the street and only then with the intention of using it defensively.
17 The sentencing judge made findings adverse to the applicant in a number of respects. He said:
"This offence was a very serious and aggravated attack which left the victim unconscious and requiring serious surgery and apparently some long term problems. Nothing can down play the seriousness of this assault.
It was not just one blow to the victim. There is an element of sustained attack with a stick and the attack continued even when a friend tried to drag him away. Whilst the offender was in company it was this offender who instigated the attack and asked others to come with him and there was nothing in the evidence to suggest that in fact at the time of the phone call from his mother that she had actually been physically attacked at that time by her partner. Whilst it is suggested that the finding of the victim that day was a chance encounter there is a reference in evidence to him picking up friends to be there with him in case.
…
I must find that the offender before me now was the main offender. He deliberately set out with some friends in case he needed assistance, to as it were solve a problem his mother had…"
18 There was no challenge on the appeal to his Honour's finding that Mr Mangan instigated the attack upon the victim or that he was the principal offender. On any view of the matters in contest at the sentence proceedings this was a finding open to him. His Honour was also entitled to assess the applicant's evidence as to the circumstances in which the attack occurred in the context of his admitted and entrenched antipathy towards the victim. The applicant submitted, however, that there was no evidence to support a series of interrelated findings in other parts of the sentencing reasons extracted above, namely that the applicant:
(a) deliberately set out with some friends in case he needed assistance to solve a problem that his mother had, and
(b) that he asked others to come with him, and that he picked up friends to be there with him in case.
19 These findings operated, so it was submitted, to impermissibly aggravate the offending because they were not supported by the evidence and were not otherwise capable of being established by inference from the evidence. Furthermore, it was submitted they were findings contradicted by the applicant's sworn evidence that he came upon the victim by chance and that his friends were with him simply because he asked them to come with him to collect his mother. It was open to the prosector to invite his Honour to reject the applicant's evidence on these matters as untruthful but that does not compel a finding that the converse was true.
20 Although his Honour made no finding adverse to the applicant on the basis of his allegedly having the weapon at hand in the car in preparation for the assault, the approach taken by the prosecutor when he referred the applicant to Mr Duffy's evidence given the previous day, Mr Duffy's account to police upon his arrest and to the contents of Mr Henderson's statement, none of which were in evidence, was misguided. The prosecutor did not put to the applicant what he had allegedly said in the lead up to committing the offence and in the course of committing it drawn from that material which would have been an appropriate way of legitimately testing the applicant's claim that he did not have the intention of harming the victim until he chanced upon him, and that he was not in the company of Mr Duffy and the others by prearrangement in case he needed back-up. Alternatively, he could have invited the applicant to read particular answers given by Mr Duffy in the record of interview, or to read parts of the narrative account in Mr Henderson's statement to police and then to have asked the applicant to either confirm that the information was true, or to identify where it was false, in accordance with s 44(3) of the Evidence Act 1995. If the prosecutor was confronted with denials to questions framed in this way, as he must have expected would be the case, it was then open to him to attempt to prove those matters by admissible evidence. I note in that connection that Mr Duffy's bail was continued at the conclusion of his sentence proceedings the previous day and that he was a compellable witness in the applicant's sentence proceedings. Instead, the questions put in cross-examination not only revealed the source of the information contrary to the restriction on the use of previous representations in s 44 of the Evidence Act, but the form of the question was objectionable since it contained the assertion that the cross-examiner considered Mr Duffy (and Mr Henderson) to be telling the truth and invited the applicant to comment upon their veracity and admit that he was a liar by comparison. In the result and despite the fact that there was no objection to any of the questions put to the applicant by the prosecutor, the cross-examination was conducted inappropriately and with what I regard as associated unfairness. The applicant at no time conceded that he knew what Mr Duffy (or Mr Henderson) had told the police, much less that they had told the truth, and he ought not to have been invited to comment on their veracity at all.
21 Although it is not the law that a sentencing court is required to sentence on the facts most favourable to an offender, if sentence is to be imposed by reference to a finding adverse to an offender, and that finding extends beyond an admission of the essential elements of the offence inherent in the plea of guilty, the facts in support of such a finding must be established beyond reasonable doubt. While it is true that the sentencing judge did not specifically refer to planning or premeditation as an aggravating factor in accordance with s 21A(2)(n) of the Crimes (Sentencing Procedure) Act 1999, he did sentence the applicant on the basis that he deliberately set out with some friends in case he needed assistance to deal with the victim. This was a finding adverse to the applicant and one that his Honour considered deprived him of the leniency that might otherwise have been available on his subjective case. It was only on the basis of admissible evidence (or inferences capable of being drawn from such evidence) that it was open to the prosecutor to refer to any of these matters as aggravating features of the offending or for his Honour to regard them as such.
22 It was the prosector's duty to ensure that the adverse findings he invited the sentencing judge to make were established by admissible evidence. He failed to do so and I am satisfied that error infected the judge's fact finding exercise as a result. It would also seem that his Honour may have transposed into the applicant's sentence proceedings facts he found established in Mr Duffy's sentence proceedings, given the detailed admissions in his record of interview. Nevertheless, it was the responsibility of the prosecutor to assist the sentencing judge so as to protect against the risk of this occurring.
23 Although I am satisfied that his Honour did not have an adequate evidential foundation to make the findings under challenge beyond reasonable doubt, he was nevertheless entitled to regard the attack by the applicant as a vicious and sustained revenge attack which he launched when he saw the victim on the street. His Honour did refer to fact that the victim's injuries resulted in permanent disability and the fact that there was a weapon used to inflict the injuries as features of aggravation under s 21A(2). There was no challenge to that finding on the appeal.
24 In all the circumstances, and notwithstanding the fact that the error identified in the applicant's sole ground of appeal has been made out, I am not persuaded that an undiscounted sentence of imprisonment of 5 years against the statutory maximum of 10 years was excessive in the circumstances. The objective seriousness of the offending was substantial. The fact that the applicant may not have foreseen or intended the extent of harm that resulted from the attack does not reduce the level of objective seriousness. The offence was not only properly aggravated by the nature and extent of the injuries suffered by the victim, and that a weapon was used to inflict them but, in my view, it was not mitigated to any material degree either by the applicant's motivation to exact revenge because of the victim's persistent mistreatment of his mother or by his level of intoxication. The ingestion of a cocktail of alcohol and drugs cannot excuse criminal conduct or its consequences. In an appropriate case, it may mitigate the offending to some extent where intoxication is indicative of the offence being committed on impulse or where it can be said that the offender's capacity to exercise judgment was otherwise impaired because of it (see Waters v R [2007] NSWCCA 219 at [38]). In the present case, absent a basis in the admissible evidence to ground a finding that the offence was premeditated, or that the applicant co-opted others to assist him to seek out and attack the victim, I accept that the influence of the intoxicants may have had some disinhibiting effect when the applicant chanced upon the victim en route to collecting his mother. This does not, however, moderate the degree of objective seriousness otherwise reflected in the evidence. The primary significance of the applicant's drug and alcohol use went to his prospects of rehabilitation in light of the evidence from Ms Edgar that he had taken steps, albeit some time after the offence, to address longstanding issues of addiction. In addition, although the applicant expressed regret and remorse in his evidence, his appreciation of the serious criminality inherent in his offending would also appear to have crystallised some considerable time after the offending. For this reason, the quality of his contrition as a mitigating factor was muted to some degree.
25 It was submitted on the appeal that the applicant's motive in instigating the attack ameliorated the seriousness of the offending. It is appropriate to emphasise that a grievance with another, whether justified or not, and irrespective of that person's proven wrongdoing or suspected wrongdoing, cannot authorise the commission of a crime (see R v Mitchell, R v Gallagher [2007] NSWCCA 296; 177 A Crim R 94 at [23] and [30]-[32]. In the circumstances of the present case, and without underplaying the reality of the pain that all family members suffer where violence in a domestic setting is persistent and entrenched, the applicant's motive for assaulting the victim was of negligible mitigating value.