The one hit one kill may work... when the opponent is tied up or whithout moving Please, stop phantasizing. Any bare knuckle full contact tournament demonstrate it doesn't work (kyokushinkai, shidokan, enshin, daido-juku,...). Do you think the fighters hit without power? They search for the KO sistematically. When I asked Master Takashi Azuma (8th dan founder of Daido-Juku) about this matter, he laughed a lot! All full contact karate masters think the same way.