[EricH]

There is one thing that I might add to Jared's advice.

When you talk with (not to, with) the mentor, have a parent (maybe not yours), or more than one, in the area. They don't have to say anything, they don't have to get involved (it's probably better if they don't), they just need to observe what happens. In fact, it might be a good idea to have other mentors and students in the area doing something (refitting the robot for an offseason, working on PR, whatever needs doing) just to make sure that if the parent does start getting involved, separation can be achieved quickly, so nobody gets hurt.

Having a rather annoyed parent can really put the pressure on the mentors who just stand there now to intervene in the future.