I just beat the boss, Cliffhoof in Icedeep Caverns. The trainer is making Cliffhoof refilling his health every sec. I only have Unlimited Health and Unlimited Mana activated. I thought he have some kind of ability that would allow him to regain his health but there is no way that it would be refilling his health too fast. I assumed it must be the trainer that affecting it. So I turn off the Unlimited Health then Cliffhoof finally stop regaining the health.
Just a minor bug. Great trainer you provided. keep up with the trainer!