What will you do if a gun is pointed at your head? Will you knock the gun out of their hand and kill the opponent? Will you run away quickly? Or will you just soil yourself? It's pointless to ask such questions. The answer can only be found when you find yourself in a similar situation. By the way, talking about morality is inappropriate. The worst scum might behave heroically in such a situation, while a "model" of nobility might abandon everyone for their own sake.