If the lawyer is witty he could make the argument that Troy wasn't aware of his actions due to seeing his life long friend die right in front him. Or, even better, Troy wasn't aware of his actions due to seeing his friend die from taking a bullet that was meant for him. That sacrifice drove Troy to react without being aware of what he was doing, one could argue. Actually, I just remembered that the lawyer did make the claim that Troy's man was a hero, which implies that he might be using that type of argument in court.
It's risky though, because that sort of narrative will only be effective on a certain type of jury, if you get my drift.
1. Banga didn't die in front of him.
2.