When you enter Passage of Conflict, there's an invisible wall behind you. If you just entered, turn around and run against the left wall, jump a few times and you can actually get behind the wall and cast against enemies who have entered. They can't touch you! if you know how to use the holes in some dungeons, like CM, and barrows, this is the same. you have to somewhat wiggle your way back there. Once back there, you will notice that you can run to the exit also.
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