And the door opens and someone who is too old to be a student and too young to be a professor and too winged to be a human walks in from somewhere else entirely.

"- Timothy, nice to meet you, am I off school grounds somehow?"

"What."

"...Timothy Laurence Way, I thought that Hogwarts had decided to shuffle up its study nooks but you don't look like you go to school here."

"...okay, if the idea of naming a school 'Hogwarts' counts for half a point this is two and a half kinds of bewildering." He glances at the exploding stars. "Three."

"You haven't heard of Hogwarts? ...are you from the colonies or something, you have a fascinating accent. And you still haven't introduced yourself -"

"...I have not heard of Hogwarts, I am originally from the United States, and my name is Campbell Mark Swan if we're doing full names."

"Originally? Have I discovered a portal across the Atlantic or not, that would be kind of a big deal."

"...you have not discovered such a portal unless it is more kinds of bewildering. God this is weird."

"Two and a half ways so? Do tell."

"It's probably more ways than that for you if you refer to the States as 'the colonies' unironically, I'm not even sure where to start."

"Hmm. I am a student at Hogwarts, the preeminent - really, the only - wizarding school in Britain; it is a magical castle with staircases that occasionally run different ways on Thursdays, rooms that appear only when you need them, and enough other oddities that when I noticed a classroom was - this - instead I didn't think much of it. The American Muggles did have a war over independence recently, the wizarding world's a bit behind the times -"

"The last time I checked Earth was experiencing the year 2179; I have been away from any ability to verify that for a few years but doubt it went backwards and doubt further that it acquired wizards in so doing."

...blink. 

"...I should get my dad or my little brother in here and you should teach them three hundred years of Muggle science, except it probably won't work in Hogwarts - do you have books or something for it -"

"What is a 'Muggle'? - and I can acquire books."

"People without magic - most people, that is -"

"...I do not think you are from the same Earth as me."

"Magic is secret - has been since the 1600s, there's an international law against doing magic in the presence of Muggles or otherwise permitting them to learn that it exists. But I'd put a lot of money on my ability to end the Statute in the next half-century and it is hard to imagine it'd still be present in - 2179."

"That and magic was de-secreted where I'm from in the early 2000s, and it was less 'wizards' and more 'summon demons to do your bidding'."

"- yep, we don't have that. ...sounds like kind of a bad idea, honestly -"

"Works out okay most of the time."

"Demons don't exist here. There're dragons and merfolk and goblins and vampires and werewolves and banshees and centaurs and elves -"

"Yes, that's another form of bewildering, I know someone who looks and sounds quite like you apart from being an Elf."

"It's uncanny."