But when they get to the middle of the bridge there’s a piece missing, and worse: the other side is, somehow, about five feet off to the left.

Rob’s puzzled. “Earthquake?” he says. “But it looks like a clean break…”

“Stupidity,” cackles Darlene. “They each built their own side wrong and didn’t know until they got out here. ‘Friendly cities,’ hah! Only enemies can ever meet in the middle, I could have told them that.”

She jumps the diagonal easily–a jump she really shouldn’t be able to make–and strides on without looking back. Rob eyes the gap and swallows.