I don't want to use deadly force, but if you're coming at me with a gun, demanding cash? Then I'll try to get away, and if you're standing in front of the car, then I can't guarantee that I'll be able to avoid you.
I'm not saying that I would be aiming at the guy, but I could understand if somebody was going to floor it to escape the possibility of a car jacking or murder attempt.
Street performers treat audience members differently. I bet he keeps the toy gun holstered for randos, however once someone's entertained by the bit and recording, he can make a robbery joke.