Then he noticed that the man was singularly like Marcus Schouler.

It WAS Marcus Schouler.

How in the world did Marcus Schouler come to be in that desert?
What did he mean by pointing a pistol at him that way?
He'd best look out or the pistol would go off.

Then his thoughts readjusted themselves with a swiftness born of a vivid sense of danger.

Here was the enemy at last, the tracker he had felt upon his footsteps.