Pretty much what everyone else said: call 911 (or *hp if your state has that option), drop back and watch.
Between us being able to track your cell phone pretty much up to the minute at that point and our units having AVL we can vector them right on target without much trouble.
And with all that great video you shoot, my guys would pretty much have rock solid PC for the stop, and great evidence in court, too
I'm not gonna slam you for scooting by him, though I hafta admit it wasn't the best move. At least if he wrecks in front of me, he is still heading away from me and I have a better chance of avoiding him, than if we have to stop short for some reason I'm not real confident that he would be able to miss me.