I actually kinda agree with the guy driving off, it didn't look it was just a regular road rage, almost like a fight with the guy in the car, even if it was the car's fault why on earth would you walk up to a car, call the cops dude!!
I'm pretty sure this is in the UK. The large thing on the roof of the car, shows it is from a driving school
The police in this country probably wouldn't even bother turning up !
I pretty the guy in the car got scared seeing a guy walk up to him like that especially if it was a student as you said, or he has a personal grudge or something