Sarah walked into the classroom, deep in thought, reviewing things for the triwizard as she walked. She nearly said 'Hi Professor" when she noticed that there was no furniture in the room. No problem for her. She would just stand. She understood what was on the board and all, so She stood and waved at her friends. She then reached into her satchel and took out her book, perfect time to study while waiting for a professor. As much as she loved socialising, she had to priortise now.