I frame by framed it a couple of times, but I was not recording it on high def. Do you think he might have been chunking the tires? Obviously even a rivet giving way is going to happen quickly at 300mph, but it seems like a piece of tire hitting the wing is the most likely thing to achieve that kind of nearly straight up trajectory.
It's been over an hour since I watched this (just got home from a race and had to put the rig away, I was in the rig watching the satelite and had to run inside to replay since ESPN was asleep), but I thought that the left spill plate remained on the wing assembly.
Jeff