The officer seems to be about to say, "Take your hand off me or I'll take it off you. Last warning."
Personally, I'd love to watch that transpire, not because of what USSS would have done to him, but because of what he'd have done to Joe before they stopped him.
I don't wish evil s**t upon people, but that doesn't mean I can't look forward to it happening when they bring it on themselves.