There was a big space between them. The space had been growing larger since they'd gotten together. It had always been there, but neither had noticed until it seemed too late to build a bridge and connect once more. Neither was a master engineer, neither had experience with this sort of thing. So they let the divide grow faster, held by a few weak ties all the way down near the bottom, and they stood on cliffs across the valley from each other, watching as a river flowed into the valley and made it impossible to cross, severing all ties but one.