Sunny's lower lip disappeared into her mouth so she could worry it with her teeth while she composed her thoughts.

"It could be that the Milesian really were--are--behind it. When I talked to Willy about it" because yes, she could be adult enough to talk to Willy without trying to kill him, "he said he didn't know how exactly London came to be infested with fairy zombies. So while this wave was stopped, it could be that whatever circumstances allowed them here haven't been dealt with."