"In the chaos, some people had no idea who the man was, the student said, and started defending themselves against the unknown attacker.
...
One of the students who appeared to jump in to defend a classmate against the tan shirted man was then thrown to the ground by a uniformed officer.
The officer can be heard on video telling the kid that the man he went after is the chief of police — Scott McElree.
“He didn’t even announce he was chief of police. We were confused," the student said."