In this scenario, the student is a passive participant in the process. The information learned is impersonal. Clearly, the teacher is in control of the learning process; his or her interests dictate what and how fast the students learn.
The answer in all three cases is that rudder is used to help maintain stability in the roll. A little rudder at just the right time can help keep the nose up in a slow roll or even an aileron roll, as the plane rotates through the sideways portions of the roll when gravity is otherwise not countered.
a part with a flat or curved surface, as a wing, rudder, etc., specifically designed to keep an aircraft up or control its movements by reacting to the air through which it moves. a similar winglike surface designed to improve stability for high-speed cars and boats; spoiler.