Originally Posted by
anerlich
Sigh ...
A single anecdote does not a statistical or scientific study make. It describes the actions of one purple belt in a contrived situation, albeit interesting. If he subdued the guy easily, he didn't need to stab him multiple times and would probably have had an interesting time in court and perhaps jail if he did so in a real situation.
I've been doing BJJ for about 12 years, but I wouldn't go to a BJJ instructor to learn about knife fighting (unless, like one of mine, he was also a black belt in arnis and had been teaching it for about ten years).