" And he's not… everyone thinks… big Quidditch hero — " Snape's bitterness and dislike were rendering him incoherent, and Lily's eyebrows were traveling farther and farther up her forehead.
Of course, she was the first to speak — intelligibly, I mean, for the emotional remarks which followed her impetuous " Oh, yes! " were not of a coherent or reportable character.
It is hard to convey precisely what BAP believes, in part because his views are so outlandish that even when stated simply, they sound like incoherent ranting.