The first way the State can prove that [the appellant] was not acting in self-defence is to prove beyond reasonable doubt that [the appellant] did not believe that he or his brother were subject to a harmful act ... Now, this first component of self-defence focuses on [the appellant's] belief at the time. A person's belief or lack of belief relates to the person's state of mind ... The State, to negative self-defence ... by proving to you that this first component is excluded, will need to satisfy you that [the appellant] had no such belief and that his evidence that he did is false. It will need to satisfy you of that beyond reasonable doubt.
The second way the State can prove that [the appellant] was not acting in self-defence is to prove that, if [the appellant] had such a belief, that he and/or his brother were being assaulted by Mr Henderson ... that belief was not based on reasonable grounds. This ... component, involves an objective test. A belief that is fanciful and is not based on reasonable grounds cannot form the basis of doing something in self-defence. On this component you need to examine the evidence and decide [whether the State] has proved beyond reasonable doubt that there are no reasonable grounds for [the appellant] to have such a belief. The assessment of whether there were reasonable grounds is an assessment made by you as sober people based upon the circumstances, that you find as a matter of a fact, confronted [the appellant], that night.
Now, the third way the State can prove that [the appellant] was not acting in self-defence is to prove that [the appellant] did not believe that what he did was reasonably necessary to defend himself or any other person from a harmful act. Again, this component focuses on [the appellant's] belief at the time ... You are being asked, in relation to this component, to consider whether [the appellant] believed, at the time of the incident, that what he did was necessary to defend himself. The law says that people are not required to wait until they are injured or killed, or other persons are injured or killed, before defending themselves or that person. They are entitled to use force before that situation arises. As I've said, the threat need not be imminent. It is sufficient if the person believes that his act is necessary to defend himself from such a threatened assault. The State, therefore, must prove beyond reasonable doubt that [the appellant] did not believe that the act he did was necessary to defend himself or another person from Mr Henderson. The State's case is that the stabbing was of such a nature that the only inference reasonably available on the evidence is that [the appellant] stabbed Mr Henderson out of an act of aggression and it was not because he believed that what he was doing was necessary to defend himself. The defence case is that you should accept that [the appellant] had a belief that what he did was necessary to defend himself and his brother from the attacks that they had experienced from Mr Henderson.
The fourth way the State can prove that [the appellant] was not acting in self-defence is to prove that there [were] no reasonable grounds for [the appellant] believing, at the time, that what he did, by stabbing Mr Henderson, was necessary to defend himself and his brother. Again, this ground involves an objective test. Again, I stress to you that a belief that forms the basis of self-defence must be based on reasonable grounds, not on something fanciful or made up. On this component you need to examine the evidence and decide whether the State has proved beyond reasonable doubt that there were no reasonable grounds for [the appellant] believing that it was necessary for him to stab Mr Henderson in order to defend himself and his brother. Again, that assessment as to whether there were reasonable grounds is made by a sober person based upon the circumstances as you find them as a matter of fact confronting [the appellant] that night.
Now, the fifth way and final way that the State could prove that [the appellant] was not acting in self-defence is to prove that the act of stabbing Mr Henderson in the back, as he did, was not a reasonable response in the circumstances as [the appellant] believed them to be. In judging this issue you need to consider the case from the circumstances of what [the appellant], believed them to be. The State's case is that even if you accept that [the appellant] had a belief that the deceased was attacking him and his brother, his response was not a reasonable response in the circumstances. The State's case is that the risk to the deceased's life, that is Mr Henderson's life and health, was such that the use of the knife to stab Mr Henderson in the back with sufficient force to go through a rib and puncture his lung when Mr Henderson was unarmed was not a reasonable response to the circumstances as [the appellant] believed them to be. You decide the issue of reasonable response applying a common sense approach. You should take into account that a person under attack, or in the presence of someone else being attacked, may have to react on the spur of the moment and cannot be expected to exactly explore all the alternatives available and how much force he should apply to the use of a weapon that he may decide to use. On the other hand if a person uses force, and quite clearly out of proportion to the anticipated ... attack he's being subjected to, then it's likely that the response would not be a reasonable response in the circumstances ... The question of whether the response of [the appellant] was a reasonable response is a matter for your assessment taking into account all of the circumstances as [the appellant] believed them to be at the time. The defence case is that the use of the knife, by [the appellant], was a reasonable response given the circumstances as [the appellant] believed them to be (ts 833 - 837).