"No shit, Ginny. We've got our suspicions, but we don't know enough yet to be sure how that happened, much less be sure we know how to keep it from happening again. At least we have an idea of how to stop another one." Charlie's expression sobered at the very idea.
He jerked a thumb at the cot by way of invitation to sit down again. "Mum says Bill's been--well, I haven't been home since this started so I can't say for myself, but I really need to owl and tell them you're all right."