[He can sense the mirror's confusion in his scribbled writing, so he attempts to clarify.]

You know, timelines! Hm. Different ways your game could have gone! For example, I am from a timeline where no one died! Where The Human stayed their hand and, together with the Player, showed us all Mercy! A friend of mine from the same world is from a version of the story where The Human chose the opposite path.

[Mettaton has no idea how this knowledge will affect the mirror. Surely it won't be that bad?]