Just to keep it interesting; How should we know that this is a Cop?
No lights, no markings, not a Crown Vic or Charger (Most common cruisers) Doesn't seem to be running city/county different color plates, no extra antenna.
So we have a guy that the rider prolly just zoomed past, with no outward markings catch up on an off-ramp (by speeding), cut off and almost hit the bike:
And then when the rider backs up to give them more room does this:
Honestly no BS? I ride with earphones/plugs in so whatever he's yelling I cant hear. Assuming squidly riding on my part, this is a road rage incident. I'd throttle the bike into him while bailing out and come up shooting. I dare CSD to come up with a frame from that video between the looking back and seeing a road rager to his the cops hand on the bike where there's visual evidence that that man is a LEO.