Notice the idiots friends split as soon as he (idiot) pulls his gun. Suddenly didn’t seem like a good idea.
also I noticed after the guy put a couple rounds in idiot he almost points his gun at the other customer. He was ready to put another one down.
If idiots friends had stuck around, the “good guy?” or one or both friends might have been on the floor too. If more than two guns were pulled it could have gotten much uglier.