"James Moriarty doesn't want to end Sherlock any more than Sherlock would ever seriously compromise Moriarty's power in a way that would put him in personal danger. He's had the opportunity, you know, early on, before Jim was quite so well connected. That business with the Lithuanians, eight years ago- that might have been before your time."

He settles down in the chair by the bed.

"They enable each other."