So they headed almost due west and kept going.

It seemed to Casey once or twice that the light followed them; but he could not be sure.
Two full nights he journeyed, and on both nights he had the light behind him.

Once it came up swiftly to within a mile or so of him and William, and stopped there for awhile and then disappeared.

Casey camped rather early and slept, and took the trail again in the morning.

Night travel was getting on his nerves.
All that day he walked and toward evening, with thunder heads piling high above the Tippipahs, he came upon a small herd of Indian ponies feeding out from the mouth of a wide gulch.