Desert Springs map boss stuck in "tail slam" animation during the 3rd phase.

I died during the 2nd boss phase (the scorpion corridor).
3rd phase (the 2nd arena) first proceeded as usual until the boss went underground to do tail slams while the scorpions spawned.
The boss never stopped doing tail slams. As soon as all the queued attacks are over, I could see some twitching, and then the boss would resume the tail slams instead of emerging from the ground.
It continued for a couple of minutes before I lost patience and left map.

Just had this happen to me as well.