The Forbiddn Forest.

Luna was out in the forest just roaming around when she was suddenly pinned to a tree by multiple arrows. She calmly stood there as multiple centaurs surrounded her. Once they realised that it was her, a student from Hogwarts, they were annoyed but relieved.

One of them pulled out the arrows, ripping her uniform completely in the process. She simply shrugged of the torn bits of cloth and continued on her walk, away from the centaurs, completely naked.

The centaurs stared at her as she calmly walked off, back towards school.