The guy that got out in a threatening manner WAS the cop in question.
A guy in plain clothes, in an unmarked car gets out, yells like some road-rage moron, I'd back up too.
Only thing missing was the:
But being this is a .44 Magnum, the most powerful handgun in the world and would blow you head clean off, you've gotta ask yourself one question: "Do I feel lucky?" Well, do ya, punk?