I usually wait until they shoot then return fire
But meanwhile, back in real life, I was driving in a row of traffic. No chance to speed even if I wanted too. And a cop on the side of the road gave me frantic moves to slow down. Duh. I continued in the flow of traffic, we were all a bit under the stated speed limit. And a short while later he was about a meter behind my bumper. Crazy bastard kept this up for 10 minutes before he figured out I wasn't speeding.