Don't get me wrong, I'm a BIG fan of martial arts training for PD. It will work against a lone BG, or maybe even two. Against a gang? I dunno. This isn't like a Bruce Lee movie where the gang of 20 BGs attack one at a time. All I'm saying is you gotta be good, AND lucky for it to work against a gun. I believe your average "martial artist" walking the street doesn't have enough training to disarm a BG with certainty. Keep in mind, this is something that HAS to work! As some have suggested - help him load the truck!
We got people in this forum recommending we carry two spare mags for your main carry piece, and a backup piece with a spare mag or reloader for that. Two fists, elbows, knees, and feet sound a little under-gunned to me.
(Run Like Hell, Fight Only If Cornered)