Yes, he initiated the fight, by throwing the first punch. He told them to pull over, got out of his car, walked to their car, and then proceeded to hit the teenager without even attempting to talk about it. There's absolutely no one to blame but the ADULT. The ADULT let his emotions take control over him instead of being the mature one. And despite all of this, if you think the ADULT was justified, how are the teens NOT justified in defending themselves? That's just terrible logic by any standards.