Actually, let me expound on that.
The choke is very likely possible. In spite of that I don't actually find the kid's story credible after thinking on it. Two things stick out to me.
First. he describes the officer driving by, throwing a profanity laced command out the window, and continuing to drive. In my experience with cops (some good some bad) one pissed enough to cuss isn't going to leave it there and drive off. Lights and siren would have been hit while the car was behind the pedestrians, and e would have forced them to come to him. Kinda standard dominance mind games that I've never seen a cop eschew in even a friendly encounter. "get the *expletive deleted*ck on the sidewalk" as he drives by sounds (to me) like how a kid that yells things at pedestrians themselves THINKS an angry cop would sound.
Second. He describes the cop continuing, and escalating the encounter while still in his car. Cops NEVER keep the low ground, for psychological and tactical reasons. Even if the door had hit the kid and slammed closed on the first attempt every cop I've ever seen would have hit the command voice and ordered the two away from the car so they could get out. A cop would have to be infuriated beyond reason to choose to have a choking match through the window of his cruiser. And her would have to display behavior strongly out of the norm of a group that reads the same playbook so much it's almost a joke.
Now I am not yet ready to call the kid a liar. People do strange, and stupid, things and there's not a lot of evidence of what happened. But his story definitely raises my eyebrows as having parts that aren't all that credible. Could have gone down that way, but it seems pretty weird.
And all of THAT said:
None of that excuses looting, or reckless popping off of dowel rounds and teargas. The folks doing that need to be put down hard. I can only hope all the honest citizens of that area can hunker down, and that they have enough ammo.