Scylla disappeared to the other side of the razor whip weed by flying over. She was meeting her troops on the other side so the rest of the joint forces could exit safely and begin their journey through the waters. They had also been given a copy of the map so that they could better scout our dangers.
Walker moved near where Alice, Su, and Midnight were to move in to the water. As they marched in to the water there was a slight fear that they wouldn't be able to breathe even though the magic skills were cast upon them. But Walker felt that even though the weight of the water began to press down on him he was lighter. The ability to breathe did not change at all.