Despite the misleading information being spread by Bruce, Wanda was not outside (or rather, she had been, but had got back inside before the web catastrophe began), and decidedly not dead. In fact, she didn't have the slightest idea that there was a crisis because she had skipped Charms to have a secret rendezvous with a Gryffindor seventh year who she was now snogging behind a statue in a deserted hallway, blissfully unaware of the panic unfolding around the castle.