"What? Oh... oh, that's clever," she said. "It should be a fairly simple fix; we just need to figure out where the looping point it, and a dispel magic at that point should stop it. The difficult part is telling where the loop starts and ends..." She considered. "We go back to the top, and mark the wall, on the way down. When we see the mark begin, we stop," she said. "That should be it."