Traffic Accidents: Backing Up in Straight Line - Simultaneous Illegal U Turn by Another Car. Who is Liab

I was in a gas station backing up in a straight line into a pump spot. A car from the other island simultaneously made a u turn into my side of the island. I hit the person's car that came into my backup lane and pump area. Who is at fault? Me for backing up? Him for making the illegal and unexpected u turn?

Traffic Accidents: Backing Up in Straight Line - Simultaneous Illegal U Turn by Another Car. Who is Liab