Well, until a few months ago, Watson would have agreed. The truth is... complicated.

"As stated, it is impossible." Watson sighs, because that sounds like Holmes to him, just a little. And that's complicated. "And as loathe as I am to say the answer is 'magic,' I've also seen a fair bit of evidence that at least in the realities of some of our fellow passengers, magic is more real than in the world I know."