Oh, come on, don’t tell me you’ve never thought about it!

[ flat sits back down on the couch, knife still in his hand like it’s more a toy than something that was just used as a weapon.

but when moriarty mentions trying to figure out his secrets, flat freezes for a moment, followed by a sigh. ]

That’s definitely unfair Professor. You probably have dozens of mysteries—you’ve lived for two hundred years after all! I’d say I have none, but you’ve already seen through that too, huh? Super unfair.