Salute!
Gotta go with PJ
If the instantaneous and then sustained pull-up had not occurred as in the other thirty-odd UAS events there would be nothing to discuss here.
The details of roll, yaw and subsequent confusions when stall warnings "quit" and then began again are all post-facto of the initial response. The devolution of aircraft stability and control are a direct consequence of loss of energy, entry into and sustaining of the stall. Why such sustained back-pressure occurred should be the subject of the Report.
Seems to me that the OODA concept is the basic instrument crosscheck, or am I way off base? I am not talking about air-to-air combat, but basic IFR flying.
Some aircraft, such as the lites I flew, had a very short "time constant". So 1 or 2 seconds without action could be bad ( think 300 degrees per second roll rate or higher, and 5 or 6 gees within a half a second). The bigger and heavier planes are much more forgiving in this regard. So 5 or 10 seconds to figure out that initial actions weren't working does not sound unreasonable.
When we all meet in that hootch bar in the sky, we can ask the guy what the hell he was thinking. I have a feeling that he would do the drill differently now that he has also had the chance to see the traces and such. Ya think?