You know that's assault and battery, right? If the guy is pulling his arm back again should the victim wait to see what happens and hope for the best?
His wife was with him, so he's not just defending himself.
Sorry, you are delusional, the man’s going to jail. Someone grabbing your popcorn and flinging it at you does not give you the right to shoot them.
Deadly force can be used to defend yourself from an imminent threat, but this was not imminent threat... it was an idiot with a gun.