OK so by your logic its OK to hit someone if they are not going as fast as you like? No, the guy waited all of 5 sec then bumped the car. Maybe if he was a little more patient the other driver would have started moving again. Hell even after his "firm stop" it looked like he still had room to pass him on either side. Guy had several options and felt his best one was to hit the other car. I'm not saying the Acura driver was in the right but dash cam guys was def. in the wrong.