I've had an exchange the last couple of days with a fellow martial artist discussing unarmed against a weapon.(knife,gun.etc) We disagree strongly on what can really happen during this sort of exchange. Hopefully, we will be getting together soon to put his theories into practice. He's much younger than me and a blackbelt in jujitsu, but also trains in judo some. After more than 20years of training in the martial arts I am absolutely certain that against an attacker with a knife you WILL get cut, sometimes badly. I am also sure no man can move faster than 1200fps, conservatively speaking. I have FBI ans SWAT training partners who agree with me. My training unarmed against weapons will most likely help me to survive such an encounter, but that's my goal, survival. I don't fool myself into thinking I can disarm a knifeman and overcome him without being seriously injured. I also beliveve MOST knife disarmements are completely unrealistic. Don't fool yourself. A good way to discover what would happen is to use white t-shirts and use a red marker as a knife. See what happens. I'll let you know what happens.