Nokhud boss fight bugged

Queued up for a randon heroic dungeon, got Nokhud Offensive. Cool, maybe some decent gear will drop. We killed all the groups we needed before the 3rd boss, got to the 3rd boss fight, the bosses did their little roleplay bit and… just weren’t attackable. We tried flying out and back in, tried pulling more trash, dragged mobs into the boss area to see if we could get them to be attackable and NOTHING WORKED. Very annoying.