He is reading a book in his train cabin, peacefully enjoy the soun of the train as it approaches the Hogwarts campus. There is a ligth knock on the door and he looks up, a student is by the door, she opens the door and smiles politely

"I'm sorry, would you mind if i join you?, al the other cabins are full" she asks

"Not at all, please seat" he says

"Are you a transfer student?" She asks as she sits, trying to make conversation

"Me? No, i'm your new DADA professor" he says