I just had a chat with one of my Bus driving colleagues. Let me drop in one of his ideas.
Highspeed stall at FL350
Pilot reaction would be. Pitch up to reduce turbulences over the wing. This reduces speed of course and pitches up momentarily till you begin to enter into low speed stall. If you get a too high AoA at that point, you may generate an unrecoverable deep stall.
This would somehow explain, why the PF initially pulled the stick, then did some nose down to slow down the vertical speed. And unfortunately it ended up in a deep stall.
Which immediately would have required throttle IDLE and THS to 0°
BEA report says that IDLE throttle was much later at around FL100
What do you think on this theory?