[Carlisle just narrows his eyes at Sans' display, as nothing he's doing is making him feel any better about this, nor is it providing him with the answers he's looking for.]

... Right. At least if this glyph goes horribly wrong, neither of us will end up dead. Probably.

[He gestures to one of the little arches on the paper that leads off the main circle.]

What you'll do is just put your hand here, and the glyph will do the rest. Ideally, the glass fixes itself. Not-so-ideally, it either doesn't do anything or it explodes from too much energy being drawn into it all at once.

[Hence the 'probably.']