As Sierra swam along, she eyed her gills and webbed hands and feet. This was her second time using gillyweed, so she still wasn't used to how odd she looked once she'd eaten it. She was sort of bored here underwater, but she at least preferred this to a random grindylow attack or something. Thank Merlin the professor had decided not to include them in his underground playground. Or whatever it was he was calling it.

It stayed kind of boring for a few more minutes until Sierra came to a wall again. It would be so easy to just cast diffindo, but when she tried to talk, it sounded more like Dbbbtttt-fnnnn-dbbbtttt. Okay, well, that did nothing. Great. She needed another way out, some way that didn't require talking. She felt around on the wall, thinking maybe it'd give on its own, but it never did. Finally, her hands ran across something stuck on the wall, and upon further inspection, she could tell there was an arrow on the wall.

It was facing upward, so Sierra swam along the height of the wall until suddenly she broke the surface of the water and came to an area where she could take a tunnel that would lead her out of the water. She couldn't do that with the gills and webbed hands and feet, though, so she pulled out the antidote, took a small sip of it, and waited a few seconds for the effects of the gillyweed to wear off. When it did, she pushed herself out of the water and began crawling through the next tunnel. Again, she predictably came to a wall, but this time, she wasn't underwater and could break it apart easily. With a quick slash downward and a "Diffindo!", the wall broke in two, and Sierra crawled through.