It sounds impossible, the kind of thing that shows up in Carl's comic books, but what's it going to harm if she says yes? If he tries something that'll hurt her, she'll do her best to stop him--and hopefully make enough noise that everyone else in the tent will notice.

Besides, she wants her arm back in business as soon as possible. Taking a little risk for so much gain seems smart.

"Okay." She slides her arm out of her coat sleeve, so he can see the plaster and bare skin. It might not make much of a difference for his...whatever this is called, his abilities, but he'll have room to work, at least.