Lisa laughs weakly. "Hey, Yggdrasil is a tree, right? That's totally related to the environment... kinda."

She focuses again after a second, now that she can see without stretching so much. "Maybe you have to be special to get the memories back. Or maybe it's something to do with the tree itself - maybe you have to be on a particular branch or something. Hey, maybe it is the fallen leaves - what if someone were saving them, or... yeah, no, this is all just conjecture," she admits after another second, sighing again. "There are too many variables and not enough information. It might all be worth noting for later, but we can't make a solid assumption right now."

Suiting actions to words, Lisa pulls out a notebook - a perhaps surprisingly plain spiral notebook - and a gel pen and starts to scribe their ideas from the last few minutes, humming softly as she goes. After a moment, she speaks again. "Oh, maybe that goes back to what the Bureau's hiding from us. Maybe there's a lot of people that suddenly got added into the cycle without having been in it before? And only the people that were in it before have memories? Or..." She trails off, grimacing. "Or maybe we're the new people." Still, she writes it down.