Such a situation gives authority to use deadly force in most states - and even if you have a duty to retreat, there's no retreat with a mob surrounding your car.
If this wasn't a scripted setup the guy did the smartest thing by not shooting anyone - just warning shots and beat it on out of there. We'll hear more - the plate number is clear.
If he was going to fire a gun and claim that he feared for his life, the time to do it was when the mob had the car door open.
Firing his pistol as he drove away, appears to me to be “showing them who’s boss.” Just attitude.