70 I have mentioned that the security guards did not give evidence. There was no evidence, therefore, from them as to any personal animosity on their part. Nevertheless, the conduct of the appellant towards the security guards before the assault took place was certainly capable of giving rise to personal animosity.
71 I accept that it was open to his Honour to infer from the appellant's prior conduct and the nature of his injuries that there was personal animosity, but my duty in deciding what inference should be drawn, as laid down by Warren v Coombes and confirmed by Fox v Percy, is to give respect and weight to the conclusion of the judge but to come to my own conclusion and give effect to it.
72 There are three other matters that bear on the issue whether the security guards assaulted the appellant because of personal animosity and whether the assault is to be regarded as a personal, independent act of the guards. His Honour does not appear to have considered these three matters in holding that the assault was "motivated by the bloodlust of the security officers involved" (at [145]) and was "an act of passion" (at [148]), such that their conduct was "not connected with any authorised method of doing their job" and was "clearly an independent act" (at [158]).
73 Firstly, after the guards had taken the appellant out of Dave's Midnight Pizza they spent several minutes (up to 20 according to Mr Gregory) with him in the Great Western Highway about 50 metres east of the pizza shop and close to the entry to the laneway. During this period, the appellant was behaving aggressively and insultingly to the guards, but they do not appear to have demonstrated any unusual anger. They merely kept "yelling at him to go away" and to "go home" and "just go, just go". Apart from the blow that was struck early on inside the pizza shop, there was no evidence that, until they took the appellant into the laneway, the guards struck or even threatened the appellant at any time during the altercation outside the shop and while they were in the Great Western Highway.
74 Secondly, there is the evidence of Mr Gregory that, after the guards returned to the pizza shop, having assaulted the appellant, one of them said that the appellant would not be causing any trouble that night as "he just got his head kicked in". As I have mentioned, Ms Synnerdahl gave similar evidence, namely, that when the guards returned, one told her that she should not worry as "we just kicked his head in". The admissibility of this evidence against the respondent may be arguable, but no objection was taken to it either at trial or on appeal (notwithstanding that, during argument on appeal, the Court referred to a possible contention to this effect).
75 Thirdly, there is the conduct of the two guards who, while standing in the Great Western Highway, kept watch on what was happening in the laneway.
76 The fact that the guards did not strike or even aim any blow at the appellant or threaten him after they left the pizza shop and before they entered the laneway, despite intense provocation from him, suggests that at that stage they had not lost their tempers and were in control of their feelings.
77 The evidence of Mr Gregory and Ms Synnerdahl as to what the guards said after the assault tends to prove that the guards assaulted the appellant in order to prevent him from causing any further trouble at the pizza shop, from threatening Ms Synnerdahl, and from returning to the pizza shop. That his intention was to return could be inferred from his refusal to leave when the guards yelled at him to "go away" and to "go home".
78 The fact that the four guards acted in concert as they did (two guards taking the appellant into the dark laneway while two remained in the Great Western Highway keeping guard) is indicative of a planned and deliberate course of conduct and not a spontaneous act triggered by personal animosity and pure personal vindictiveness.
79 In my view, these three matters outweigh the violence of the assault. There may well have been an element of personal animosity and personal vindictiveness, but, in my view, the three matters indicate that this element was not the dominant cause of the assault. In my opinion, the dominant cause of the assault was a desire on the part of the guards to do their duty by ensuring that the appellant would not again make a pest of himself at the shop, would not return to the shop, and would not again molest the customers, particularly Ms Synnerdahl (who was told "not to worry" by one of the guards after the assault had occurred).
80 In the light of the conclusion to which I have come concerning the reasons for the assault, I am of the opinion that the assault was "incidental" to the employment of the guards in the sense that this word was used by Latham CJ in Deatons (at 378). The assault was not a gratuitous unprovoked act. It had a great deal to do with the performance of the guards' duties. And, to use the expression adopted by Latham CJ in Deatons (at 379), it was an act "performed as on behalf of the employer" and "in the supposed furtherance of the interests of the employer". The guards were not acting as "strangers" in relation to their employer with respect to the assault (in the sense that this phraseology was used in Bugge v Brown (at 118)). The guards, in the course of carrying out their employment, committed "an excess beyond the scope of [their] authority (see Dyer v Munday (at 746)).
81 In my opinion, to paraphrase Dixon J in Deatons (at 381), the assault was an improper act due to ill judgment but done in the supposed furtherance of the master's (the respondent's) interests. The assault was an act to which the ostensible performance of the employer's work gave occasion and the assault was committed in furtherance of the employer's interests.
82 The guards assaulted the appellant "in the course of fulfilling [their duty] which the [respondent] entrusted to [them]" (to use the words employed by McTiernan J in Deatons at 382).
83 In my opinion, the conduct of the guards was so connected with acts that the respondent authorised them to perform that they may be regarded as modes - although highly improper modes - of doing them (and, thus, falls within the test formulated by Salmond, approved by Williams J in Deatons (at 384), and by Gleeson CJ and Kirby J - subject to qualification - in Lepore (at 539, [51] and at 614, [307], respectively)).
84 The remarks I have made explain why I consider the requirements laid down by Gleeson CJ in Lepore for liability by an employer for unauthorised criminal wrongdoing by an employee are satisfied. The same applies to the reasons expressed by Gaudron J in that case. The assault was committed in the intended pursuit of the respondent's interests or in the ostensible pursuit of its business, and so satisfied the requirements of Gummow and Hayne JJ in Lepore (at 594, [239]). The connection between the unauthorised acts of the guards and the acts which their employer, the respondent, authorised, was sufficiently close, according to the criteria laid down by Kirby J in Lepore, to extend vicarious liability to the respondent for the intentional wrongdoing of its employees.
85 Accordingly, I am of the opinion that the appeal should succeed.
86 The respondent pleaded other defences that were unnecessary for the judge to deal with, in the light of the conclusion to which he came. Those defences were not raised in argument before this Court and it is not clear whether they remain alive. The issue of damages is outstanding. Accordingly, the matter should be remitted to the Supreme Court so that the remaining issues can be resolved.
87 I propose the following orders: