There's a big difference b/t shooting someone w/a gun & defending yourself, DM.

I've trained with guys who are 300 pounds. I could never win in a direct confrontation w/such a person, I'm petite (no matter WHAT level belt--most guys are bigger/stronger than me, just how it is), but I can use their energy to take them down enough to get away if they rush me. And for many situations, like a quick grab, that is all you need--time to run away.