"Isn't using your favor to ask her to help out the definition of forcing her hand?" Strange asks. "Of course, I've no idea how strong binding magic is when you get to concepts like 'favors' over 'contracts.'"

What's a faerie's favor worth anyway? That's something that Strange doesn't really know and he's certain Yuya doesn't really know, so he presses on to a different aspect of the conversation.

"Hopefully it won't come to that and you can use your favor for something fun or useful."