There is a new, scarier thing to worry about. Promise is probably not secretly evil, her actions and words being consistently inconsistent with the nefarious plan as initially outlined.

"Right, of course you wouldn't. A fairy wouldn't need someone's help to enter the mortal world, right? I..."

He hesitates for moment, wondering if Promise is in fact hostile and trying to trick him into revealing that he knows... before realizing that she'd have no reason not to simply call him on it.

"Until just now", he confesses, "I've been suspecting you of being responsible for creating the gate that brought me here, and of kidnapping someone through it. But that explanation doesn't make sense anymore, and I think that, yes, I do need to get back as soon as possible, because of the alternate explanation for what happened."