Zalmarath, The Colossus Boss bugs

Playing witch class bugs him and makes him unable to hit him or even have minions hit him. Blocks all boss progress. When he breaks off part of the boss arena when you walk into that area you become bugged and the character starts glitching out but you are still able to stay in the area. The enemies that come flying in also get bugged because of the barrier so some of them also end up falling and glitching out.