Sure enough this is going to be turned into "The Cop punched a girl because she was JAYWALKING!" UHHH...no. Thats the typical attempt to turn the bad behavior of these girls around on the cop. He had every legal right to stop them. How they behaved from that point on is on THEM!
Absolutely, it's apparently already being portrayed that way in some markets. They're editing the video down to just the punch without anything leading up to it and saying how the cop punched her for jaywalking.
From what I've heard about it, the officer has been on the job for 4 years, backup took more than 3 minutes to get there from when he called - that area is under patrolled. I don't think he used excessive force, I also think he was lucky there were only the 2 girls to deal with and not the entire group there. That could have turned very ugly for him, very quickly.
Not that it will get much play in the media, but the girl who was punched has a history of assaulting police officers already, and clearly wasn't punished hard enough since she's willing to do it again. Chances are she won't do much, if any, time for it this time either. Juveniles get less than 1 year for helping to beat someone to death in Seattle, she won't get much for this unfortunately.