It seems to be a problem of triggers. You seem to bypass a trigger which starts turning the room. Take your glowstones back and try to swim to and fro in the passage leading to the turning room. You don't need to swim too far away, the trigger cannot be too far. You should hit the trigger in the end and persuade the room to turn.
Neither spells nor weapns will help at the room. The game is full of bugs
so that it cannot be excluded that you have become a victim of some of them. If swimming will not help, try quitting the game, reastart, and swim in the passage again. Also try saving the game outside Collaseum, quitting the game and swimming to the door again.