Professor Remus Lupin

He walks into the Hogwarts’ bathroom, just to wash his hands When he is standing by the mirror, washing his hands and looking at his scarred face, he hears some strange sounds from one of the cabins Hello? Is somebody here…? He asks but the only answer are those sounds. He walks up to the cabin and sees it’s unlocked so he repeals the door

What are you doing in here? It’s a bathroom cabin…