Originally posted by DozyWannabe ...
My educated guess (and it is a guess, so feel free to take or leave it as such) is that it would have gradually returned to neutral, following the elevator demand.
My thoughts are similar, though without receiving any positive pitch attitude command, would the THS return to say 4°NU. Remember, the A/P is OFF and the aircraft will follow SS inputs - which it was doing.
The Pitch Attitude / Flight Path Angle and/or V/S would "ring the bells" in this situation, but surely outside the software designer's criteria.