Road Rage Caught on camera

A video of three guys going at it in some sort of road rage incident is making the rounds online.  One guy has a bat but LOSES, and gets knocked out with one punch.  Then his passenger tries to fight the guy and gets put in an MMA-style chokehold.   

The people in the car behind them got it on their dash-cam.  But their reaction doesn't seem very natural, so some people think the whole thing was staged.