I'm suggesting that an opportunity presented itself, and he may have taken advantage of it. I wouldn't have suspected this except for two uncomfortable items here:
1. The guy has a background of dishonest/criminal conduct.
2. The guy was screaming like a little 'effing girl for no damn good reason.
I would’ve made a scene too given what happened. I’d be screaming, “White flyers matter... white flyers matter!”
I think the guy was screaming because he was tazed. It also explains the disorientation that seemed by apparently as he was being dragged off.
It look to me like the cop deployed the tazer up close as he was leaning over the passenger.