As someone who was a bouncer for some of the top clubs in a major city, this is the type of shit that will get you fired or in jail real quick. It's not cool to strike a patron or someone on the street like that for multiple reasons. One, it's unnecessary. You can simply push him back without throwing him to the ground as you're not in danger. Two, that first shove could have killed the kid. He was shoved with force right next to the edge of a wall and onto a hard surface. If he had landed the wrong way, dude is brain dead. If that kid was injured, he could have gone to jail or been sued here as
@Clear Winner was asking.
This behavior is the exact thing that bouncers are supposed to not do. Our job was to be the clear headed person in the room of intoxicated people. Minimize risk, not create havoc. Dude slaps a patron in a real establishment for dancing too close to you, and you're out of a job. The only time it's acceptable to throw hands for any reason is if you're defending yourself against violence.