reporting a driver

[Fazafou]

  However, I wonder what case you could make against him as the cause of the accident.

This sounds harsh, but the cause of this specific incident was the woman behind driving too close to be able to stop for an emergency, which is what happened.

Although this guy was a nob, the woman should have been keeping a safe distance.

Basically you have a reason for the emergency braking, she has no reason for not stopping in time.