They would stop to feed, surely, or to look back and listen--in a strange country like this it was against horse-nature that they should wander far away at night unless they were thirsty and on the scent of water.

These horses had drunk their fill at the little pool below the spring.

They should be feeding now, or they should lie down and sleep, or stand up and sleep--anything but travel like this, deliberately away from camp.
Pink tried loping, but the ground was too treacherous and his horse too leg-weary to handle its feet properly in the dark.

It stumbled several times, so he pulled down again to a fast walk.

For a few minutes he did not hear the bell at all, and when he did it was not where he had expected to hear it, but away off to one side.