My friend who is very much into martial arts told me the best thing you can do if a knife comes out in a fight is to run. It doesn't matter if you have training. He said if you can run, then run. Knife fights always end with lots of blood. This guy's martial arts training doesn't just apply to studio training either. He's in some branch of the special forces and is off somewhere in Germany right now, so he knows a fair share about hand to hand combat and weapon usage. I respect him a lot and take his advice readily. Besides that, I don't see myself ever carrying my Regulator anywhere I'd get into a fight.