look as long as we go in expecting the who to trust to end up with "no one," "yourselves" or "a flying whale named Chartreuse*" and the undead one to be a "you can't" THEN WE CANNOT do anything but go "awesome we now have koi official answers on these things" and thus be proclaimed winners

I say shelve the mirror for now, but it can be a good thing to bring up that there's anything to know about mirrors, so they can then have that conversation!

*if there are any such flying whales, we love you, and are contractually obliged to screw up your names, given your relative lung capacity and length of whale song notes as otherwise not matched by tiny human lungs