When he feels both the charm and her hand in his own, he opens his eyes to look down at them. A right answer? That would mean there's also a wrong answer. So he's not really supposed to let go, or what?

"Okay. How about..." He squeezes her hand slightly, then shifts his own, so he's taking the charm away but leaving their fingers together, and ends up hooking his pinky with hers again. "This?"