Slightly off topic, but if someone points a gun at another person, can that person feel like his life is in danger and shoot to neutralize the threat? If you were in a store and someone did this you'd probably have shot in self defence. The only difference is the distance. I have thought about this before, would you be justified?
IMO, that would start getting into a really grey area. I don't like grey when it comes to killing another human, I like black and white. Just because someone points a gun at me, I don't immediately feel that my life is being threatened to the point of me defending myself with a lethal method. In the case of these jerk offs, they were just looking at me through their scope, not threatening my life. Of course accidents happen and you never point your gun at something you don't intend to shoot, and all that safety stuff, but we're not talking rocket scientists here. Even if they took a pop shot at me, I would choose flight over fight in that situation. My odds of making it out of there alive greatly increase when I take two steps into the brush and disappear versus standing my ground and letting them get another shot.