1st and most......calm down, a calm person will be mostly a rational person.
2. make sure you get all the facts straight
3. do not go over and stick your head in someones car and start screaming, you just my pull back a stump, and make sure it's the right person & car.
4. approach the person and talk to them calmly. most rational people will talk it out rather than fight. offer to go over any video and talk to witnesses.
If all of these don't work, remind them that payback just may be a medivac! ;~)