[No answer again. In fact, she's keeping her back to him as she skips, still humming and singing that same tune. It's not until the glass trees become so dense that she needs to slow to a fast walk that she speaks, though her back is still facing him.]

If you stay here after sun set, you can go back, but you can't go back. You'll go back, but you won't be you. Not anymore. You stay here. So it's like you never go back...

[She stops walking and tilts her face towards the sky for a moment or two before walking again. When she speaks again, her voice has changed a bit. She still sounds like the same girl, but perhaps a few years older. It might seem like she got a bit taller as well.]

...but if you don't stay here until sun rise, you won't be you here either! But then you can't go back at all. There won't be anything to go back to!