[krapp]

>No martial art makes it safe to deal with a guy with a weapon. Even an idiot with a knife or a brick can get lucky.

Yep. If someone approaches you with a gun or a knife, and your opponent is actually willing to shoot or stab you, even a black belt is probably getting stabbed or shot. The best defense is always to not be there at all. Though sometimes that's not an option (but more often than not, it is.)