I suspect the officer didn't have the forethought to draw his heater and blast him once or twice. Too many witnesses on a busy roadway, most likely. so, a quick kick to the face.....just to show him who is large and in charge.
There were several suspects still at large in this incident, including a man in a yellow shirt with a gun...is it your expectation that the two officers should pussyfoot around with one suspect who seems ambivalent about complying when there are other armed and dangerous suspects roaming around?