Originally Posted by
rondog
A suggestion -
Have your friend put on a white t-shirt, load his magazine with snap caps, but don't load the chamber, then holster his weapon as he would normally.
You stand ready as the attacker, with a big red magic marker, cap off, ready to go.
Then, you attack him with the marker as quickly and "savagely" as you can, while he tries to draw his gun, rack the slide, and bring it to bear on you. Be sure to occupy/attack his hands/chest/face as much as you can.
Then stop and assess his "wounds", and the wisdom of carrying an unloaded gun.