http://en.wikipedia.org/wiki/Tueller_Drill
Some of the concealed carry crowd think firearms would solve the problem. 21 feet...and that's when you know it's coming. Throw in the adrenaline response when you didn't see it coming and your bowels are already sliding out of that new orifice you just acquired in your belly. Tough to be a hero when your slipping in your own gut pile and you just realized it's on when it's actually over. Toss in a double retention holster and mind altering substances and it just gets worse.
Life ain't the movies and when we meet life head on we encounter some biological hard wired responses.If we haven't had much time training a response during an adrenaline stress situation we tend to flail. Heck the trained tend to flail.
I'm pro conceal carried but the more I read people advocating for concealed carry on these forums the more I wonder if it's just another Pandora's box.