When sent on adventure Serrated Shoulder Blades ability is still bugged and does not deal any damage to the attacker. I checked wowhead and it was reported to be bugged in January and it’s still bugged to this day. I watch whole fight unfold and I can confirm that the ability does no damage to attackers
So if you would like to report a bug, please do so following this guide:
That’ll make sure it gets to the right place.