Guys, it's even simpler than that. Once another person or any other living being finds itself in front of your car, you stop - unless of course your life is in danger which clearly wasn't the case here.
It's not ok to "push by" with your fender, you may be breaking the guy's leg if the things line up the wrong way, or perhaps you dislocate his knee cap.
So cop or not, once he is in front of your car, you simply cannot drive off.
I mean, would you do that if it were your son, wife, GF or mother sitting there?
2015 F80 ED
2004 Z4 3.0