First, don't block an exit.

Second, if you do end up accidentally blocking an exit, stop blocking it as quickly as possible, especially if someone has indicated that they need to use the exit. (That was the holding the same railing as you bit.) This can mean moving into the car, stepping out of the car, whatever. Just stop blocking it.

Third, don't fucking trip someone. Ever. For any reason.

Fourth, when you do commit assault in a location that has plenty of security cameras, don't come crying to Reddit and ask us what you did wrong.