at 500mph yes....here is my purely speculative sequence of events based on a few videos I've seen, first I believe there 'was' some sort of mechanical failure (the tailwheel makes me believe something went wrong in the aft section) the trim tab is harder to confirm, either way it really did seem to me the aircraft made a sudden pitch up from a level attitude, so the pilot was not under any g loads until the pitch up, I believe that was an effect of a failure, this 'may' have put the pilot unconcious through the rest of the sequence, the continuous pitch up resulted in the aircraft stalling out and flicking putting the aircraft inverted right above the crowd line, the pitching force was still in place and the aircraft pulled through vertical straight into the crowd below, good chance the pilot was unconcious because I heard no reduction of thrust.