Not sure, but sirens would help riders AND drivers, they weren't on at the beginning of that video... maybe they were on earlier but don't know why they would be turned off
also the way the helmet was ripped off
I don't know if the rider was in the right at any point here but from what I can see he's pulled over, looked submissive, and the police didn't do much to de-escalate the situation.... of course we don't have audio so we don't know what was being said, but there wasn't a ton of time between the police stepping out of the car and on to him