I don't see anything in the video suggesting the a/c stalled. It was turning, and appeared to tighten the turn before impact, but the fact that it impacted the ground was due to standard loss of altitude in a turn of any kind.
1. He may have been attempting knife edge "flight". (around a point)
2. He may have been attempting a split ess.
3. He may have thought he was hook trapping onboard the ship
4. He may have gotten so far up his own tail everything tumbled.
I favor #4
Two things come to mind
This is a rather farfetched example of "aerodynamic" flight.
Once past the limits of control authority, all bets are off.
bear