The police will look at this as no one got seriously injured and that is a good day, they won't give him a polygraph or even revisit the scene, if they cared that much there would have been a ticket involves to lay blame. Unfortunately we all have t be on guard and have a possible escape route need be. I know, who would think it a such a low speed.
It is sad to hear accident stories but at the same time we all can learn form others mishaps, I am just sharing my experiences and ASSUMING the outcome.
Best of luck, Motiv