Gary,

Makes me sick to watch man. I think your initial assessment of a stall is absolutely correct. Stall at the top, followed by a continued elevator pull (not yet realizing it was a stall), than a relax on the elevator which was the pause in the turning, followed by a re-application of the elevator in a last ditch effort to recover the bird before the impact, which re-initiated the stall due to the slow air-speed.

Whatever it was, it sucks. Don't let it get you too down. We all know, that it's not if, but when.

Take care and call me if you need anything.

Chad