I had that happen to me with no damage. Some young girl had the green left turn arrow and started thru to turn left then stopped after just passing the cross walk. I tapped into the bumper and honked the horn and stuck my head out yelling at her as to WHY DID YOU STOP??? She gets out of the car claiming she needed my insurance info cause her friend was injured. I told her no way and just move it. "Both" girls got out to look at the bumper when I said there IS NO DAMAGE. Why are these people even allowed a license. Frikin scammers ^69
Now that sucks. Unfortunately it's going to be his fault because he hit her from behind. Maybe some witnesses could help you out if any. Get the ticket reduced because that's also going to suck on his license or permit.