[ Now that's something Childermass would love to hear about later, but until then— ]

You forget. Most the workers here are, at least temporarily, changelings. That's quite fae enough. [ Or it should be, in his opinion. That it worked on him in particular, well, there's more to that story than just the carnival. To the rest, he can only shrug. ] On her own? I doubt it. She's bound to her Queen... or should be. Whether she remains so after such a failure is anyone's guess.