3hole
My issues are of design, and the use of trim in this case. The PF commanded a climb up without the assistance of TRIM. So either by good luck, or a/c design, the THS stayed put, and he relied on elevators only.
At the top, the design input TRIM after the STALL. That seems unwise. Commanded to be sure, but none the less, it responded.
Several of his inputs served to lower the NOSE, and the STALL sounded, and he pulled up again.
So, once STALLED, there would not only seem to be no need for all NU from the THS, but that it would be highly dangerous to leave it there.
With a continuous STALL warning, one would hope a 'smart' a/c would return the THS to neutral, and allow the Pilot to recover with elevators.
Since the speeds had returned, it becomes especially apparent (to the aircraft) full up THS is not a good thing? No alert, no lowering the THS,
I could easily be the thick one here, and not you.