I figured if your in a fight and you want it to end quickly break the persons leg, or arm and its done. The Pain is so intense I doubt they will continue especially if you break someones leg. Does anyone know a martial art that focuses on bone breaking?
brazillian jiu jitsu......not bone breaking, but joint hyperextension. for all intents and purposes, you bend someones arm in half the wrong way it might as well be broken.
remember, you are responsible for your actions, if you seriously hurt someone (even if "they started it"), you're in trouble.