Oh, you know Quirrell already, do you? No wonder he's looking so nervous, that's Professor Snape. He teaches Potions, but he doesn't want to -- everyone knows he's after Quirrell's job. Knows an awful lot about the Dark Arts, Snape."
I think the normal order of the sentence in bold is: Snape knows an awful lot about the Dark Arts. I'm wondering if there are any literary effect for that inversion?