There are several points here. The first is verbal non compliance. The second is physical non compliance. When the girl started to walk away, what options does the officer have? Should he continue telling her to stop? Should he physically stop her? The officer chose the latter. That's correct procedure. Now, as he was physically constraining the non compliant person, another person comes up and physically and verbally interferes. At this point, he has two people resisting arrest and escalating the situaion.
For all of you Monday morning quarter backs out there, why don't you list the options availiable to the officer at this point. I'd love to hear them.