Is bug or not?

Elvis

You bodyguard your bane and is immune to slayers

Covfefe

I just tested this, and confirmed slayer immunity for everything except for armor ignore which works under a different formula for pets.

But they might say it's working as intended, under bodyguard the player bodyguards the pet so receives the damage, player isn't a dragon.

(I should add, under testing, the use of armor ignore against a bodyguarded 5 slot pet resulted in a swift death for the bodyguard)