… how they came to be near dead and unable to die.
… how dire exhaustion flung them, Hunter and Hunted, out of the Wide World.… how they fell like burnt-out stars into this covert place where the Mill-Wheel turns parallel to the Wide World.
perpetual motion machine
… how they picked themselves up, tended their bruises, and abandoned the hunt.
… how they settled in at the Mill like an old married couple, giving over to the Wheel their perpetual chase.