From a news report I read it was the biker who instigated the incident by deliberately jamming on his brakes after maneuvering his bike directly in front of the moving SUV. In fact there was a video of that incident on the internet last night. But more than that there is a racist element to this attack by the bikers that is not being addressed by reporting. One report stated there were as many as 60 bikers involved. One local comment stated it is a regular occurrence in New York City to see these biker gangs terrorizing drivers with illegal maneuvers, yet complaints to the authorities bring no relief.