Yeah, the kid was big... don't let him take control, big. I'm sure the cop went from wary to scared to panic very quickly. It's a shame it ended like that, but I can think of a couple equally bad endings. From that point on it's like the contrived script from a Bollywood movie.
The witnesses said, boy=good, cop=bad. No surprise there. I can see them all wearing warn-a-brother shirts, locked arm in arm, high kicking in unison like the Rockettes. This is the reaction to years of cops covering up mistakes/misbehavior by cops, truth be damned. First allowing, then (probably as part of rationalizing to others & themselves) condoning, finally approving, cops bullying citizens.
I've seen it to many times. I can understand a cop thrown into a situation where things could go bad in a hurry, so he/she must be large and in charge quickly. No, we will not discuss it, you will do what I say. That said, I've seen some sadistic fuckers who have no business wearing a badge, abusing scared and bewildered people, for no discernible reason other than breaking the boredom, or perversion.
It's part of the polarization of America. Aiding the divide and conquer strategy to retain control of the minions, by the oligarchs. Strategy, is giving them too much credit, though. They do guide and nudge, but the path to division is human nature. There must be an Us and Them, otherwise I wouldn't know who to watch out for, and more importantly I wouldn't have anyone to blame when I fuck up.