".. how exactly?"

Look, Alice could be practical here. She could start with the fact that it's impossible to leave here. But who knows, perhaps this person has the magical ability to be able to leave after all, in which case she wouldn't want to stop them, or maybe Rui wouldn't believe Alice if she told her about it in the first place. And then she'd have to try it out to believe it regardless.

So Alice may as well ask instead about what she's foremost curious about here instead.