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.
Inboard Hardware: Rudders. Continued... Rudders may be either the unbalanced type, or designed with some degree of balance to make turning easier (see Plate 58). An unbalanced rudder has the rudder-stock or pivot point at the extreme forward end of the rudder and all the blade area is aft of this pivot point.