"Ten points to Team Hermione," Harry smiled, weakly and sadly. "And that is exactly what happened. The Weasleys slipped past me, looking so grateful - Polyjuiced into that scared family - that I felt like I’d won the entire fucking war with one victory! So I didn’t bother with my secondary checks, despite Narcissa warning me to the contrary. I just ushered them quickly through with a cheery little wave ... then was left to hate myself when I realised how they’d screwed me."