They said it was full, but it wasn't full. They had paid money to get into the bar, but it wasn't returned after they wouldn't let them in. One of the guys (with Carroll) got into a disagreement with the bouncer and punches were thrown, but Ahmad had nothing to do with that. Ahmad just walked away. He didn't even see it happen.
Batman never struck or assaulted anyone. The officer grabbed him, and Batman jerked away. That was the extent of it.