The ballroom is an outdoors garden party, all of a sudden, and the dream (okay, fine, whatever - have your bloody changes, probably grumbles some demon somewhere) changes to accommodate the scenario.

So Hermione looks up, and forgets all about the drink she was going to read, in favour of a. a gloriously beautiful horse, and b. Cedric who is also there and holding his hand out.

"What?" His shoulders ripple - are shoulders meant to do that? She holds out her free hand, and takes Cedric's. "How good of you to bring an escape route."