The door opened almost immediately after he'd knocked and he returned the faint smile with nod of greeting as he stepped inside the room and watched as Severus removed his memories and put them in the pensive.
'Naturally,' he answered the question, a small smirk on his lips. He was fairly sure Severus would not bother with giving him lessons if he was not the kind to take his studies seriously. 'There is a limit to the usefulness of theoretical studies though, as you have pointed out yourself on occasion.'
He waited for Severus to finish with the pensive, glancing around the room.