Good point about having a knife or spike when executing a strike, I can see how that works. And as far as the powerder... I just see that as a dried form of peper spray/mace.
Im just wondering if that "magic one strike" is a theory thats actually taught or if thats just for demo's.
What was the stuff he was throwing at his attackers?
You are not going to get many people disagreeing with the fact that one boshi ken or powder in the face is going to stop someone. But we make it a lot less bloody because we don't want to freak the parents out.