The monarchs say, you know -- "it takes a great deal of power" and all that. But it's still all magic, which is hard to prove.

[ Although... ]

I could show you some, though. I mean, little humanoids with wings, that could be science. Maybe not science we've encountered before, but they have blood, bones, that sort of thing.

[ The bag Hermione gave him is on his belt. John pulls it off, pulls on the laces to open it. ]

Reach inside until you can't anymore, pull something out.

[ It's a bag that can hold basically everything despite its small size; that's something, right? That's proof, or something like it. ]