Zane, sorely puzzled.

"Jack, by all that's strange it's getting bigger." Sure enough the spark of fire, or whatever it was, grew larger and larger.Col.Zane thought it might be a light carried by a man on horseback.

But if this were true where was the clatter of the horse's hoofs?
On that rocky blur no horse could run noiselessly.

It could not be a horse.

Fascinated and troubled by this new mystery which seemed to presage evil to them the watchers waited with that patience known only to those accustomed to danger.