First, I piddle myself. Then I run and hide like the coward I am!
Leave/hide and call 911.
I would utilize my gun rights. I would pull out my concealed weapon, walk up behind him and tell him to drop the gun.
I'd probably walk right up to him, as if nothing is wrong. His reaction to that, would determine what would happen next.
I would have to be in that situation for me to know. I know, I'd get the Hulk! Then I'd say, '' Stick em' up, the boogie man is coming!''
If I could shoot and kill this person without harming anyone else I would....otherwise call 911 and wait.
I would shoot him, I always carry my gun.
I would march up to him and beat his a55, then shoot him with his own gun, and I would wedge my business card between his front teeth and leave.
I would duck out of the way, because at least 5 other people would probably be concealing handguns too and they would deal with it. This. Is. ARIZONAAA!
Id grab a can of something and hit the guy with it hopefully knocking him out or to give enough time ot grab the gun. Then call 911