His eyes no longer saw the old Cassidy, brave and loyal to his duty, a chivalrous enemy, the man he had yearned to love as brother loves brother, even in the hours of sharpest pursuit. In Cassidy he saw now the hangman himself. The whole world had turned against him, and in this hour of his greatest despair and hopelessness a bitter fate had turned up Cassidy to deal him the finishing blow.
A swift rage burned in him, even as he raised his hands. It swept through his brain in a blinding inundation. He did not think of the law, or of death, or of freedom. It was the unfairness of the thing that filled his soul with the blackness of one last terrible desire for vengeance. Cassidy's gun, leveled at his breast, meant nothing. A thousand guns leveled at his breast would have meant nothing. A choking sound came from his lips, and like a shot his right hand went to his revolver holster.
In that last second or two Cassidy had foreseen the impending thing, and with the movement of the other's hand he cried out:
"Stop! For God's sake stop—or I shall fire!"
Even into the soul of Peter there came in that moment the electrical thrill of something terrific about to happen, of impending death, of tragedy close at hand. Once, a long time ago, Peter had felt another moment such as this—when he had buried his fangs in Jed Hawkins' leg to save Nada.
In that fraction of a second which carried Peter through space, Corporal Cassidy's finger was pressing the trigger of his automatic, for McKay's gun was half out of its holster. He was aiming at the other's shoulder, somewhere not to kill.
The shock of Peter's assault came simultaneously with the explosion of his gun, and McKay heard the hissing spit of the bullet past his ear. His arm darted out. And as Peter buried his teeth deeper into Cassidy's leg, he heard a second shot, and knew that it came from his master. There was no third. Cassidy drooped, and something like a little laugh came from him—only it was not a laugh. His body sagged, and then crumpled down, so that the weight of him fell upon Peter.
For many seconds after that Jolly Roger stood with his gun in his hand, not a muscle of his body moving, and with something like stupor in his staring eyes. Peter struggled out from under Cassidy, and looked inquisitively from his master to the man who lay sprawled out like a great spider upon the sand. It was then that life seemed to come back into Jolly Roger's body. His gun fell, as if it was the last thing in the world to count for anything now, and with a choking cry he ran to Cassidy and dropped upon his knees beside him.
"Cassidy—Cassidy—" he cried. "Good God, I didn't mean to do it! Cassidy, old pal—"
The agony in his voice stilled the growl in Peter's throat. McKay saw nothing for a space, as he raised Cassidy's head and shoulders, and brushed back the mop of red hair. Everything was a blur before his eyes. He had killed Cassidy. He knew it. He had shot to kill, and not once in a hundred times did he miss his mark. At last he was what the law wanted him to be—a murderer. And his victim was Cassidy—the man who had played him fairly and squarely from beginning to end, the man who had never taken a mean advantage of him, and who had died there in the white sand because he had not shot to kill. With sobbing breath he cried out his grief, and then, looking down, he saw the miracle in Cassidy's face. The Irishman's eyes were wide open, and there was pain, and also a grin, about his mouth.