Shooting someone in the back from point blank range will cause a lot of pain and make you very unpopular. The sporting thing to do is to ask them to surrender if they dont then shoot them.Surrendering only works when you sneak up behind a lone opponent unnoticed. If you are in a face to face fire fight they are not going to surrender and nor are you. Jumping into a wooden hut containing three opponents shouting surrender doesnt work. You will get shot at close range.