"Your alternate, yes. We spent time in Bete Noire together, and then, in between cities he and Mrs Malfoy were brought to London." Whereupon Sebastian made sure to keep all of them well away from any wizarding authorities until they could get away from Britain and into hiding on the continent. Of course, this is not the behaviour of friends, merely two gentlemen possessed of enlightened self-interest.

"He's diligently working to try and correct the, well, frankly embarrassing gaps in my knowledge."