We could argue on semantics. From a professional level (I am a teacher) the line is crossed when new material is introduced. Tutors re-enforce and help students understand material that teachers have introduced in class, usually working on an individual basis. They do not introduce new material or conduct a class. Like I said, I’m happy, and would encourage students to help each other learn under my supervision, even to conduct parts of a class like kihon or taiso. I would not accept or expect them to conduct a class without my supervision unless they had the qualification to do this (minimum level 1 coaching accreditation). To do so would be in direct conflict with the MAIA policy (the peak governing body for martial arts in Australia), risk losing insurance coverage and be against the risk management policy for my club.