This is very similar to the recent incident in India where the co-pilot pushed the column unintentionally and was unable to understand what was going on when the aircraft went into a dive.
It also raises the question what the co-pilot was looking at when he twisted the rudder trim. It looks completely different and is in a different place from the door unlock. If he was looking at the instruments how come he did not see the control wheel moving way out to the side?
Above all it raises the point that most pilots have little experience of manual flying these days and when an unusual attitude develops they are initially stumped. Our sim training exercises lack the surprise factor which seems to have been the problem here.