Bodyguard B Ignores Divine Shield

Describe the problem. Be as specific as possible!:
All of BGB's attacks are able to bypass the "Absorb" / "Guard" mechanic and still hit me for normal damage.

Divine Shield states
"Generates a protective shield when hit that absorbs damage up to 5 times and increases Weapon Attack. The protective shield lasts for 60 seconds and cannot be generated again for a fixed period of time once activated."

You'll notice in the SS that Divine Shield is the top right most icon and I take 18xx damage, instead of getting a "Guard" animation. While this is nothing too serious, it is rather funny that this is the only monster / boss in the game, that I've found so far, that is able to ignore the skill's mechanic.

 Images of problem