I'm running this tonight, and it's going to come up (knowing my players), so what is a fey circle? Is there any extra background or details on such a thing in any Paizo source? I keep getting Magic Circle Against X spells when I google.The scenario implies it's a fey-specific shrine, I guess? Combined with the old "ancient Native American burial ground" hence building something on top of it being a problem.
I think it is essentially a fey stone henge
Also they not only built a time based magical device in the middle of a fey stone henge dedicated to the fey lord of time, they took the most important stone in the circle, broke it into pieces, and used it as part of the building.
Basically they installed a flux capacitor on a Tardis, and then put the whole thing on a train going 88 miles an hour. We are lucky they only broke the town, not the planet.
That's a hilarious metaphor, and it seems pretty apt to me. There's a reason the fey call her "Reckless Rhona."