Any fic that's over 800,000 words long is going to generate questions, especially one so densely plotted.
- Loki states when he teleports them over that he could do so because he'd placed tracking signals on each of their equipment in case of kidnap, so he's got a basis to work a teleportation spell. The implication is that Tony wouldn't let him do the same/has his own arrangement of tracking signals - which, considering Tony's reputation for paranoia, isn't entirely unsurprising.
- Doylist Answer: That part of the fic, introducing Jade Scott, was written very early on, before information on the existence of Ilvermorny, and details about it, was released. Also, the author is British.
- Probable Watsonian Answer: One of SHIELD's most senior magic involved Agents was Nick Fury, who was more familiar with Hogwarts, and recommended it.
- Makes sense, thanks.