Despite Rhett being the mean old bat that he was, Selena kept the strange map her upperclassman sold to her their first week of school. She had spent a lot of time studying the map that she didn't need to look at it anymore, which was pretty useless since nothing was where it should be. It was just more fun to find new places in the castle by following the map. Especially since it made no sense when the two were compared. The girls bathroom on the second floor was most definitely not anywhere near the North Tower and this hall filled with armor was not the girls bathroom.
Still the shiny armored hallway was pretty cool, and Selena really had no idea where she was so she had accomplished her goal. Now if only she could figure her way back to places she recognized.