Slowly, interminably the minutes ticked away as the girl stood motionless, striving desperately to think of something she might do to prevent the catastrophe. If only she had some way of knowing when the stranger was near she might cry out a warning, even at the risk of Lynch's violence. But thrust here in the background as she was, the unknown was likely to come within range of Lynch's gun before she even knew of his approach.
Suddenly, out of the dead silence, the clatter of a pebble struck on the girl's raw nerves and made her wince. She saw the muscles of Lynch's back stiffen and the barrel of his Colt flash up to cover the narrow entrance to the ledge. For an instant she hesitated, choked by the beating of her heart. Should she cry out? Was it the man really coming? Her dry lips parted, and then all at once a curious, slowly moving object barely visible above the rocky shoulder that sheltered Lynch, startled her and kept her silent.
In that first flash she had no idea what it was. Then abruptly the truth came to her. It was the top of a man's Stetson. The ledge sloped upward, and where she stood it was a good two feet higher than at the entrance. A man was riding up the outer slope and, remembering the steepness of it, Mary knew that, in a moment, more of him would come into view before he became visible to Lynch.
White-faced, dry-lipped, she waited breathlessly. Now she could see the entire hat. A second later she glimpsed the top of an ear, a bit of forehead, a sweeping look of dark-brown hair--and her heart died suddenly within her.
In that instant of supreme horror, Mary Thorne found time to be thankful that terror struck her momentarily dumb. For now, with lips parted and a cry of warning trembling there, she saw that it was too late. Like a pointer freezing to the scent, Lynch's whole body had stiffened; one hand gripped the leveled Colt, a finger caressed the trigger. At this juncture a cry would almost surely bring that tiny, muscular contraction which might be fatal.
From behind the ledge Buck's hat had disappeared, and a faint creak of saddle-leather told the girl that he had dismounted and by so doing must have moved a trifle out of range.
Sick with horror and desperation, the girl's eye fell upon a stone lying at her feet--a jagged piece of granite perhaps twice the size of a baseball. In a flash she dropped the bridle-reins and, bending, caught it up stealthily. Freckles pricked his ears forward, but with a fleeting, imploring touch of one hand against his sweaty neck, Mary steadied herself for a moment, slowly drew back her arm, and, with a fervent, silent prayer for strength, she hurled the stone.