The Night Horseman by Max Brand

A thought is like a spur. It lifts the head of a man as the spur makes the horse toss his; and it quickens the pace with a subtle addition of strength. Such a thought came to Buck Daniels as he stepped again on the veranda of the hotel. It could not have been an altogether pleasant inspiration, for it drained the colour from his face and made him clench his broad hands; and next he loosened his revolver in its holster. A thought of fighting -- of some desperate chance he had once taken, perhaps.

But also it was a thought which needed considerable thought. He slumped into a wicker chair at one end of the porch and sat with his chin resting on his chest while he smoked cigarette after cigarette and tossed the butts idly over the rail. More than once he pressed his hand against his lips as though there were sudden pains there. The colour did not come back to his face; it continued as bloodless as ever, but there was a ponderable light in his eyes, and his jaws became more and more firmly set. It was not a pleasant face to watch at that moment, for he seemed to sit with a growing resolve.