Hopefully the shooter didn't have a CCW permit to feed the anti's fire.
This just goes to show that it doesn't pay to respond in any aggressive way to road ragers.
Do your best to drive away and don't pull over to have any type of engagement, innocent or otherwise. Always stay armed, always be ready to respond, but don't engage in any verbal banter, hand gestures or pull over to the side of the road to see what the problem is.
Keep driving and if they pursue, call 911 on cell phone and coordinate with the dispatcher a safe place to have a patrol car intercept on the road.
Agreed Bark'n. Be the bigger man.
He may have just been going for a burger. Having said that, he should have kept an eye on the other guy & not pulled in if it wasn't safe.