Take a real close look. Either Katt Williams has a stunt double o these guys just stunted on the comedian while in traffic. Not sure exactly what caused the traffic "altercation" but the two gentlemen in the car can be seen arguing while riding side by side with Katt aka A Pimp Named Slickback.
From what I gather it boils down to a pissing contest; fellas you know what I'm talking about where you want to show the next man who's the bigger man out the situation. The two recording can even be shown flashing money and claiming Katt rented his car.