He looked down when he felt the cat bat at his ankle and smiled: "Nice try." he said, before his eyes moved to the picture again, observing it silently for a while, before he put it back to its place. There was no use in staring at a stranger man.
Next he was moving his steps towards the bookshelves, watching closely at every book. There was not much that had to do with magic that Severus hadn't read, but he was surprised of the accurate selection, and picked one particular up to go through it quickly. He noticed then that the place was spot clean, quite amazing.