The pilot seat occupier in this case needed quick assistance, not quick and unexpected yaw. I'll bet he didn't have an extra three seconds to look for the knob given the gyrations of the aeroplane.
It was the activation of the wrong switch that caused the 'gyrations'. He shouldn't have been that stressed sitting there monitoring the aircraft that he couldn't look at the switch before activating it. If he was, he should not have been on the flight deck in the first place.