"I was about to turn to the element of acting without lawful excuse, which is an element of both of the counts. A lawful excuse exists when the acts of an accused were done by him as a result of his believing upon reasonable grounds that they were necessary to be done in order to defend himself or another from the actual or threatened violence of another. Now it is both good law and good sense that a person who is attacked may defend himself and this applies equally to defending another from attack. However, it is neither the law nor is it sensible that a person should be permitted under the pretence of defending himself or another, to attack a third person. The ultimate question for you is has the prosecution proved beyond reasonable doubt that Portelli was acting unlawfully because he did not believe on reasonable grounds that what he did was necessary to defend Bonnici. So it is necessary to consider the actions of Portelli and all of the surrounding circumstances in order to determine whether he acted in defence of Bonnici or a pursuit of some other purpose and whether the prosecution has proved beyond reasonable doubt that he was not acting in defence of Bonnici. Now these considerations may bear upon this question or those questions I have just posed. Consider first of all was the action, from which Portelli argues he was defending Bonnici, the kind of action which called for his action of defence of Bonnici or was it something that a sensible person would ignore? Consider this. Was it an action, the consequences of which could easily have been avoided? If you find that there was a common purpose, could it have been avoided by not stopping the car and continuing on or could it have been avoided by Bonnici retreating from the situation that was created when he stepped out of the car? Now there is no obligation on a person to retreat and indeed, it may be, in certain circumstances and you may consider this one of them, that it would be a dangerous thing to attempt to retreat. However, a failure to take obvious evasive action might well indicate an intention in both accused to use the occasion for aggression or retaliation in keeping with the alleged common purpose, rather than acting in defence of one's self or another. Consider also did Portelli use unnecessary force? Now although a person who is defending another is not required to weigh up specifically the extent of force required to resist an attack, the use of force which is plainly disproportionate to an attack, may also be an indicator of the occasion being used for aggression or retaliation, rather than for self defence or defence of another. Consider this. If you come to the conclusion - and it is always a matter for you - that Bonnici was the person who began the confrontation by stepping out of the car and acting in the way you find that he acted, was the original aggressor in that or any other sense or was otherwise acting pursuant to a common purpose as alleged, acting in common purpose with Portelli, it is necessary to have regard to the course of events that followed thereafter. So if you have come to the conclusion that Bonnici was the original aggressor or the person who began the confrontation, did Bryans increase the level of aggression or increase the kind of aggression so as to cause a need for Bonnici to protect himself and a need for Portelli to come to his defence? Now it might be that for example a person who answers a push in the chest by producing a knife, is doubted in the assertion that they were acting in self defence or defence of another. Now it is obviously not the situation here, but that's the sort of example when you consider the level of the threat or the actual violence that was faced in the attack and the response to it. Further, if you came to the conclusion that Bonnici was the original aggressor or began the confrontation in the ways that I have outlined and always remembering it is for you to decide whether you do, you should have regard to the course of events that followed in order to determine whether Bonnici ceased to be the aggressor, either by quitting the fight or by being defeated in it and then independently of his original intention or aggression, defended himself against a new attack and then being joined by Portelli in facing that new attack; Portelli defending Bonnici against that new attack. Those are the sorts of considerations and illustrations of questions that you should examine in order to determine that ultimate question that I posed before. Has the prosecution proved beyond reasonable doubt that Portelli was acting unlawfully, that is without lawful excuse, because Portelli did not believe on reasonable grounds that what he did was necessary to defend Bonnici? Another way of putting it is, has the prosecution disproved that Portelli was acting in defence of Bonnici? It is for you to examine all the circumstances as you find them to have been and to consider both the actual belief of Portelli and the reasonableness of his forming such a belief. An irrational fear or a belief formed without reasonable ground for it, does not justify violent activity by an accused. It is also not for you to say what you would have done in the same position. The question is whether Portelli believed on reasonable grounds that it was necessary in defence of Bonnici to do what he did. If you find that he had that belief and there were reasonable grounds for it or if you have a reasonable doubt about the matter, then you would and indeed must, find Portelli not guilty and that would be subject to your finding on the issue of whether the use of force was out of proportion to the attack faced by Bonnici." (Emphasis added.)