http://www.cbsnews.com/8301-201_162-57605406/nypd-seeking-motorcyclists-from-videoed-road-rage-run-ins/
Read the report, it says the first time he stopped, the bikers were denting his car with their helmets. It looks to me like the bikers instigated the whole thing. My thing is, if you cause the entire problem, why would you post a video of it online? I think they were mad bacouse the cops set up check points preventing them from getting to time square.