Boss despawned, arena locked, instance bugged

Bug Report ID: #578550903

I'm stuck in the Azmadi fight, he despawned after I ran away from his phase where it spreads out then jumps at you. Log out doesn't work, logging back in I'm put into the same instance. The arena is locked so I can't get to the check point. I can't TP because it's a boss fight.

One of his moves spawns him outside of the arena and then it's stuck. https://ibb.co/vxsHbVJN