He had advised that the student had been unresponsive in releasing controls and was having to apply quite some force to override.
I wonder if many instructor courses these days have any focus on techniques to regain control from a frozen student.
No relevance to this incident, but remember being told about a TIF near Sydney many years ago where a "prospective student" (actually a pilot who had his medical suspended for psych reasons) tried to exit the aircraft mid flight. When the instructor tried to stop him, he threatened to crash the plane on landing.
Talk about a rock and a hard place.
