You're driving along a fairly deserted road at night. You see the lights up ahead, a cop has someone pulled over. As you get closer, you see some ground and pound going on. And the cop is recieving. He's alone, with no back up, and the guy doing the pounding is twice the cop's size. You have your cell phone, and your trusty CCW. What do you do? Not what is the logical choice, what do you actually do?