So, 2 possibilities. Total & utter crew incompetence, which we can mitigate by introducing illusions involving the inner ear/fatigue/whatever . . . or, Boeing are very glad to adopt that , thanks very much. Frankly, no matter how tired/disorientated, I find it difficult to imagine any reasonably experienced crew member holding forward Stab-trim input for 12 sec, but, I haven't flown a FlyDubai roster. . . . . . .