Salute FC!
The previous comment had to do with the large increase in fuel flow and then the control wheel force disconnect and then the dive.
Looks like crew jammed throttles forward, for a few seconds, maybe to counter the nose down trim. Who knows? Then we saw the death dive.
Something happened at T - 20 or 30 seconds before the dive, but it was all set up by an undocumented feature of the plane"s flight control architecture and logic that every pilot should have known and seen in a sim.
From my grave, I would come back and haunt every engineer and company executive that let this new "feature' be implemented without letting this lowly line pillot know about the doofer and what it does and under what aero conditions and.....
Gums rants.....