Wait, rewriting the world formula? How does that work? [ It sounds both similar and drastically different from re-writing history. ] What does that do, exactly?

[ But to their own question- ]

Ah, right, only one per time gate. After that it was like all of the energy was expended and we had to find another artefact to open the next gate. Once they were open they stayed that way, though. We didn't really have anyone to explain the exact details to us. I hope that answers the question?