I just looked at it again...it seems like the guy in the Viper might have gone through that mild right hand turn at full throttle, got loose which carried over onto the straight, then the car probably snapped back and went flying the other way which was in front of the BMW and off the track. It is amazing to think that one second you can just be driving along, and the next you could be getting slammed in the side by a Viper going triple digit speeds.
I crapped my pants watching it! That is one of the craziest things I have seen on a track. Go figure - it had to be a Viper. I don't know what combination it is between too fast, too hard to handle, or the types that are drawn to Vipers but they seem IMO to have a disproportionate number of incidents and crazy things happen to them.
Disclaimer: Again - just my opinion and I don't pretend to represent anyone else - blah blah blah so if you own a Viper, have Viper friends, etc - don't get all worked up on me. I really don't care if you agree with me or not / FWIW.