I think one thing that is difficult to address is that when you think someone is trying to kill you, it does tend to get you highly adrenalized. In that state, it can be difficult to make good decisions about when the threat has ended and most people tend towards the "FINISH HIM!" school of thought.
The problem is every shot or stab has to be justified. If stabs 1-14 were justified and you stab 15 times, you have a serious problem. I don't know any easy answer for how to address that; but I can tell you that one factor ends up in a lot of example cases.
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