" A five-foot rattlesnake was sunning on another flat rock

fifty feet away. It raised its mean wedge-shaped head and studied him. As a boy, he had killed scores of rattlers in these hills. He withdrew the gun from the backpack and rose from the rock. He took a couple of steps toward the snake.

The rattler rose farther off the ground and stared intensely.

Travis took another step, another, and assumed a shooter's stance, with both hands on the gun.

The rattler began to coil. Soon it would realize that it could not strike at such a distance, and would attempt to retreat.

Although Travis was certain his shot was clear and easy, he was surprised to discover that he could not squeeze the trig ger. He had come to these foothills not merely to attempt to recall a time when he had been glad to be alive, but also to kill snakes if he saw any. Lately, alternately depressed and angered by the loneliness and sheer pointlessness of his life, he had been wound as tight as a crossbow spring. He needed to release that tension through violent action, and the killing of a few snakes-no loss to anyone-seemed the perfect prescription for his distress. However, as he stared at this rattler, he realized that its existence was less pointless than his own: it filled an ecological niche, and it probably took more pleasure in life than he had in a long time. "

― Dean Koontz , Watchers