Loadrunner - are you sure that the disease is restoring the enemy to full health? Disease actually lowers the maximum health of the enemy, so maybe that's what you're seeing.
In the Evelyn fight, she bugged out after I summoned a Fire Elemental behind her, and an enemy mage Fortified her. She just kept moving back and forth randomly and did nothing. I think it was the Fire Elemental, because she started behaving normally after the Fire Elemental expired.
