Just curious, but why are you driving slower in the left lane? Whey did you fail to correctly and lawfully "yield right of way" to the faster driver? Just because you are driving faster than the person in the center lane does not mean that you get to hog the left lane, you still have to pull to the right to allow him to pass.
Yes, he was an idiot. But that does not remove your guilt.
Looked more like the BMW driver clipped the rear of the car in the center lane. The front end of the car in the center lane came toward the left lane and the rear was pushed to toward the right lane.Looked to me like the driver of the other car, in the center lane....saw him coming, and tried to steer into the far right lane........ and the BMW rode up his front tire. Check it out, using the 'pause' button.