Pretty obvious that this behavior is not indented and could be easily fixed by not making the boss attackable for a bit like the pirate ship. I would imagine a blue would agree with me if asked, but this doesn't sound like something they would even glance at. Super dick thing to do but literally nothing you can do to stop it. Like the sorry and underpopulated state of a lot of servers, Blizzard does not care and will not help you. Buy a glider.