Reimu wondered as she walked why she couldn't find any sign of the merfolk camp.  Even with the fog, she should still be able to see something in the distance, she thought.  This stone dock was another mystery, though as she looked at it in confusion, it dawned on her.  She didn't know much about the merfolk, and had never met one in person back home, though she had heard of them, but they all lived underwater.  She couldn't remember if they were able to come above water for very long, but it only made sense that their cities weren't above surface level.  While she wasn't certain that things would work the same here, it made sense if they did, and it would also make sense to have some sort of landmark for those living on the surface to find them.  Now that she understood why she couldn't find their camp, she walked out onto the pier to examine whatever it was she saw at the end of it.