The closest I have ever been to that situation was the night I happened to be in a convenience store when some LUB (Large Unruly Bastard) started kicking the crap out of some poor soul for no apparent reason. I am licensed and I was carrying, but elected to give him a GOOD whack over the head with the steel fire extinguisher that I found hanging on a suppot pillar. Took the fight right out of the LUB, I can guarantee you, and caused a LOT less paperwork than I'd have had to do if I had ventilated his worthless ass!!