Stuck on Arid Plains Boss Room

The boss fight started and the Sandworm created its unpassable terrain, at the same time the big scorpion jumped out of the sand exactly into the unpassable terrain created by tha sandworm.
Result: I can't damage the boss, it can't damage me.
As I'm inside a Boss room, i can't tp out, tp to the checkpoint or reset the game after logoff.
Help, please