What constitutes a teacher?
Anyway, how about this idea from a fairly experienced competitor:
Your student takes it to the level the other guy takes it to, so long as the referree is ignoring his job. Why? Because he has to protect himself. Just covering up isn't acceptable because if the ref is as bad as you say, he may not stop the fight, and bad things can happen.
YOU need to have the cojones to step in and separate the fighters if it's getting out of hand, and then go talk to the organizers of the event if the refs aren't doing their job.
"In the world of martial arts, respect is often a given. In the real world, it must be earned."
"A stupid man's report of what a clever man says is never accurate because he unconsciously translates what he hears into something he can understand. "--Bertrand Russell
"Liberals - Cosmopolitan critics, men who are the friends of every country save their own. "--Benjamin Disraeli
"A conservative government is an organised hypocrisy."--Benjamin Disraeli