Well, it's... t-that's kind of a complicated answer. We sort of, uhm... f-found a way to use everyone's souls, together, to approximate the s-seventh. It's a little hard to explain, and uh... honestly, I d-don't know exactly how it worked, either. I don't r-remember. Nobody, uhm, r-really does, except for Frisk-- uhm, the seventh human, who uh, fell down. They helped a-all of us to escape.

[It's not... a lie, exactly. That is what happened, in a rather roundabout manner.]