There are plenty of other pictures now from different angles showing the trim tab departing.
At those kinds of speeds, lack of trim would see the nose pitch up quite violently, right?
High-G knocked the pilot out, aircraft kept rolling as it was already in a turn.
Q: what happens if you roll and keep pulling?
A: The same thing that happens on many a pilot's first barrel roll: the nose ends up pointing straight down.
It makes sense to me. Lets see what the smart folks at the NTSB come up with.