[...]

We'll be much more powerful when this's all over, yeah? So maybe we can figure somethin' out. If not in your world, at least in this one, so none of us forget you an' all you did for us here. I ain't gonna leave 'til we figure that out, at least! 'Cause you've done a lot for us, an' you deserve to be remembered.

[Obviously this isn't really a fix. It's very possible he'll forget Day as soon as everything's said and done. But he wants to believe that they'll have a chance to keep their memories, to put things right before they return home. And maybe, maybe that magic will be enough to touch other worlds, and to fix all the problems they have back home. Maybe it won't be enough, but there's only one way to find out.]

...Hypothetically speakin', 'course.