Additional observations-
1. He guns the throttle going uphill, just before turn-in for the Turn of Fate. Then he palms the shifter forward, selecting a higher gear. But it doesn't sound like he gets back on the throttle in that next gear. If he had, this would have kept more weight on the rears. It sounded like he had no throttle input at that time. After cresting the hill, getting off the throttle, and then having the pavement go away from him, the rear end of the car was very light.
2. The "Turn of Fate", as I am want to call it, is in shadows. Going up hill, the sun is warming the pavement. But after cresting the hill, the pavement is shadowed by the trees. This diffrerence in track temperature might have made the pavement in the shadow several degrees cooler than the sunlit pavement, and so offered less traction. Cold pavement is bad, just like cold tires.
The more I think about it, the more this looks just like what I did in Turn 6 at Willow Springs. I had the hardest, fastest spin of my life there. You gotta make sure your car is pointed straight as an arrow when you crest the hill in Turn 6, because the car gets real light coming over the crest, and if you have any hint of polar rotation, it will continue to rotate all the way around, when the suspension unloads, and the contact patches are lightly loaded. The natural human tendency is to get off the gas when the proverbial sh*t hits the fan, but if you do that, the weight transfers forward, and the rear end will get light. It takes considerable reprogramming to get hard on the gas, when you feel the rear end coming around, and so transfer weight rearward, to make the rear end stick. I gotta work on that....!
