Cataclysm Knight fight shield is suddenly garbage

Just fought this dude in the guild dungeon and all of a sudden he has a perma shield that Never disappears...Froze him, taunted him for several turns in a row to make sure he couldn't renew it, let him kill a team member several times and revived them, and he Still has the shield up.. What the flip??
No stats of his shield are provided under his buffs, he just has a magic permashield that can absorb infinity damage and never expires... Since when??
Actually, while I'm here there is either a bug or visual glitch with %chance to lower enemy defence weapon gems; it says defence lowered by 0 when i try to use it on my main hero and it lands on an enemy, and it did this time when i had it on Christina, who it normally works/displays properly for.
No stats of his shield are provided under his buffs, he just has a magic permashield that can absorb infinity damage and never expires... Since when??
Actually, while I'm here there is either a bug or visual glitch with %chance to lower enemy defence weapon gems; it says defence lowered by 0 when i try to use it on my main hero and it lands on an enemy, and it did this time when i had it on Christina, who it normally works/displays properly for.