[He's already wondering what else he can do or if it can even be bigger, but right current thing first.]

Sounds like a solid idea. Let's see... [A quick look around and he walks over to a particular spot, the mirror floating behind him.] This should do the trick. Just need to move it here to check the fit...

[Opting to physically move the mirror instead of wild hand gesturing, he carefully pushes the mirror in place and...]

And we're good! [He swings the mirror back out to open it for the mushroom.] Now for the guest of honor.