Spoiler: The officer has been investigated at least twice before, once for assault and another for shooting an unarmed black man. In both cases it seems he was likely guilty of breaking the law but faced no consequences. I can’t imagine a more shocking turn of events

He denied threatening the driver with arrest, but kept threatening him with obstruction, which is a secondary charge unless I'm mistaken.

Sounds like this cop needs to be out of a job. What an asshole you have to be to threaten a bus driver, of all people