That being said, the camera clearly showed the guy signalling, slowing down, and turning off. This particular cop needs to find another vocation.
She appears to be attempting to stop on the ice directly behind the vehicle and slid into him instead of coming to a halt on the non-ice road and then pulling behind slowly.
Of course, maybe this civilian female technique of stopping is now PC and taught to all MN Highway Patrol Officers these days. It appears I'm fortunate I don't have to live in MN from what I see in the video.