"You mean this was supposed to happen?! He can't believe it.
Q finally turns to Severus and stares. This wasn't at all what he was expected, but that doesn't make it any better. "What do you mean Severus? No one told me anything. I did this all on my own. Er, whatever you're talking about." That was English; he recognised every word and he's still at a complete and utter loss.
"Well no, it's not," Q concedes the point. "It's not much of a poet either. For being sorted into the wrong house? Or the right one?" Where is Stephen Hawking when you really need difficult things explained?