To be fair it's a pretty obscure bug. I'd never have noticed it if not for the annoying way in which we pull Kilrogg.
True, it is odd in requiring to be in range but not facing. Buff persistence has to be a pretty standard thing in their test suites, hopefully this edge case is added to them.
Fingers crossed they fix it quickly.
"Tell them only that the Lich King is dead... and that World of Warcraft... died with him..."