content: If the person runs up on you like that, you can punch them clean in the face and knock them out. If that person dies because they fell and hit their head, you will not be found guilty. The precondition is the person running up on you aggressively like that and you PUNCH them just once. Some states have a "like force" clause in their self-defense. Key point here is you are not the aggressor in the situation and you use minimal force. Then you'll win that case 10 out of 10 times. A similar case happened when a nutjob ran up on Buzz Aldrin and Buzz clocked the retard in the face, knocking him out. It was great.