Did I miss something? What is it that you describe as "acting frantically"?
That is a subjective term, but he was squeling “don’t touch me” and other things in a high pitched voice.
He honestly seemed like a bit of a nut, and in the cop’s place, unless I was absolutely certain he was unarmed, I would be genuinely concered that the guy might pull a gun and shoot me or a knife and charge me.
I find it odd how this is considered some horrible abuse by the cop. The cop did not unholster his gun until the guy refused to take his hand out of his pocket. He kept the gun pointed downward. He was not verbally abusive to the guy yelling at him and in no way physically harmed him.
If you want to quibble with the cop’s methods, go ahead, but making this out to be some outrageous act is absurd.