[ the moment that flat sees the teacher in question, his eyes widen slightly in surprise. he stands silent for a few seconds, taking in the essence of his new mathematics professor.

and laughs. ]

You almost had me there, sir. [ he walks into the apartment, appearing casual. in reality, however, he was on high alert. not because of moriarty’s identity, though—that’s just how he is in general. ] You really looked like how the books described Sebastian Moran for a second—but you’re just how the books described Sherlock! With gray hair, sure, but close enough. Pretty incredible!