Outlawry is the same as "Disrespecting the King's Men" in the eyes of the King's men.
The cop in question is a knucklehead for several reasons (Assume the youths in question were, indeed obnoxious, profane, and disrespectful. Not a stretch, IMO):
1. Getting physical with non-violent, non-threatening types.
I did not notice any threatening or dangerous behavior by the slackers. I think the cop just didn't like to see his authority questioned by punk slackers. I hope he got his satisfaction. I also hope he gets the karma-wedgie he deserves.
2. Getting physical without somebody to watch his back (later rectified)
I kept thinking, "Why doesn't anyone use their skateboard to bash his skull in?" while he is fiddling around on the ground. Obviously, the cop discounted the threat the other slackers posed. If the threat of the punks was so negligible, why the need to throw down in the first place?
3. Threatening to use OC for not flopping over on command
Hmm, I wonder if this occurred in a state where using OC is considered some sort of force to be used only in reaction to another threat of force. OC & Taser used as a means of compliance & not officer safety. Is this their training? As Borat would say, "Niiiice!"
4. Running off willy-nilly after another slacker while the first is cuffed and hanging out on the street.
No explication necessary.
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Knucklehead had the means to call in reinforcements. It would certainly have been wiser to wait until they had arrived before going Royce Gracie on one punk while the others stand around with bludgeoning objects in hand. Also, the presence of multiple LEOs on-site may very well have caused the punks to disperse.
Knucklehead just plain lost his cool and acted irrationally. For the love of Pete, he ran off after another punk while leaving the first to hang out on the city street.
IMO, nobody in that sordid scene acted like an adult. Just a bunch of punk adolescents, one with the power of the state behind him.