Why didn't anybody come to his aid? Surely you don't stand around screaming for help while a person is being manhandled right in front of you? If they assaulted him first, he had every right to defend himself physically and others come to help him.
Although I must say the cyclist maybe pushed it a bit too far. Would be better to just leave it if you don't have the necessary backup.
Another thing to add, it's highly unlikely the police will do anything about this case. He can always pay a few thousand to the officer who handles the case to bury it.
