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Unarmed combat
This "art", is brutal, cruel and effective...because it is a matter of LIFE AND DEATH while using it!!
Used in varying "styles" by different militaries all over the world and with varying degrees of efficiency in different combat vocations, it is probably the only "pure" fighting art.
In martial arts, you DO NOT want to snuff the life out of your opponent. Especially if you are a shaolin monk, right?
So, most martial arts are there for defence and then to overcome your opponent without much damage to yourself and making your opponent yield.
In unarmed combat, there is no tap out. If you were in the jungle, there are no judges and tap outs. Giving your opponent a 2nd chance probably means death for yourself!