There were several people standing around watching the event.
One person had a video camera.
The jack boot singled her out and said he did not feel comfortable.
He said she should go in her house.
He seemed to have no problem with the other observers.
Probably because everybody else stood in a way that didn’t cause the cop to be concerned, like standing at a distance and not two feet from the point of arrest like this woman did.
Once somebody has made themselves known, during an arrest, as being a possible problem, that person remains a factor during the arrest until it’s conclusion.