If you are behind him or to the side of him and he is firing at the exit, what do you do? Run to the exit, lie down and wait for him to turn around and shoot you, or attack?
Sure IF you’ve got a lucky shot. But that’s situational. Chances you don’t have that shot. People watch too many action movies, in reality the guy comes in the front door and starts shooting, all the folks in the “easy” zone to stop him are the first ones hit. Especially in a loud dance club, probably most folks don’t even know something is going on until he’s “cleared” a pretty large circle around him. At that point your options are try to be a hero hoping others will follow and probably dying pointlessly, or try to get the hell out. The right answer is get out if you can, help others if possible, but the whole “follow me” bum rush thing is by and large Hollywood balderdash.