[It might be helpful! Not that Herbert cares all that much - he's one of the very few out and gay students at Hogwarts, though it happened because of a spell. He's just noticed Holmes's odd fascination with Moriarity, and has privately speculated, though he's never really asked about it.]

Because that's where you got Sorted. [impatiently] I don't know, because you're clever and ambitious, I guess. Obviously you're smart enough to be in Ravenclaw ... well, now you are. And you sound like you're from somewhere other than Dublin now, so I expect some other things have changed. Holmes would probably know more. [sighs] Which means we'll have to find him.