[Sherlock is aware of his error, but thinks nothing of it. There are always flaws, always mistakes, and Moriarty's response is mild enough to make him doubleback over his phrasing. Too rash at times, despite his own brilliant mind. He cannot be perfect, as it turns out.]

I underestimated him at first.

[It's a confession of sorts, but one that he would readily admit to.]

But he is far easier to deal with than the other Holmes, so I will appreciate his presence just the same.