After so many years of offering unsolicited opinions on this forum it is time to ask for advice. Slowly driving the e39 M5 on the right side of a down sloped San Francisco street. Night time, no car light in the mirrors behind me so I took the time to park it right. As I start to exit the car I thought the car blew up with a very loud noise. An electric rental scooter was making its way down and hit my open door. Some damage to the door due to the over extension. The scooter guy probably hit the door frame around his chest. I helped him to the curve with some other friends of his. Called 911 and stayed through the ambulance and police phases. His own friends acted as visual witnesses confirming it was not my fault. The report still assigns me the fault. The scooter person admitted he was drinking beers before, and of course was wearing no helmet. The scooter had a tiny LED light somewhere. I saw all dark and no vehicles behind me all along. Do I need a lawyer? Should I go to the judge and contest the fault determination? The M5 is really well built.