Sure the bus driver might have done something wrong, but the cyclist obviously wasn't hit so it couldn't have been that bad.
You have the route number, the bus number, the time, and the intersection, all of which is recorded in the GPS system and is more than enough to file a complaint with the cops and the local transit authority. Or you could screw over dozens of people during rush hour for the equivalent of road rage.
It's a very busy part of town. Bikes have a right to use it and not have asshole drivers, bus or otherwise, abuse them, but if the guy wasn't even hit it's just the standard "shit happens on busy roads" that everybody deals with. People make mistakes. People who ride the bus have places to go, too.