[It's easy to get into. The bright colours, the infectious excitement of the kids surrounding them. William might have a bias for drama but Heather's loving it.]

Then we'll overthrow the system. Whose idea was this, anyway? Taking a bunch of impressionable little kids and pitting us against against each other right from the start? We'll start a revolution. Oh! Or visit each other through secret passages! I bet a place like this has secret passages out the ass. [Squint.] Arse? Should I be trying to be -

[She's interrupted by the sound of her own name, McGonagall's accent brisk and ringing. And Heather, totally caught up, grins and squeezes William's hand and bounds to the front.]