Once more he sprang into the saddle, the restive horse pawing the ground and leaping forward before he was seated. His master held him back while they ascended the long slope of the hill, and stopped him as they gained its summit.
The descent was a gradual one, down into a beautiful valley. For a mile or two the road was perfectly straight and the rider, shading his eyes, glanced along it. In the distance a moving object attracted his attention, and as he gazed at it, long and strainingly, the terrible smile once more wreathed his white lips.
He opened the holsters, drew out the pistols, examined them carefully, replaced them, felt of the stirrup straps, tightened the girth, settled himself in the saddle and shouted "Go!"
The command electrified the horse, and he dashed forward again faster than ever. As they tore down the slope of the hill, it occurred to the doctor that he had not formed any definite plan as to what he should do to Pepeeta! "Shall I kill her, also?" he asked himself.
The thought sent a shudder through him and he instinctively pulled on the bridle.
"My heart will tell me," he cried aloud, and loosened the reins of his horse and of his passions. The very semblance of humanity seemed to be suddenly obliterated from his countenance. This was no longer a man, but an agent of destruction rushing like a missile projected from a cannon. There were only two things present to his consciousness—the carriage upon which he was swiftly gaining, and the fierce smiting of the horse's hoofs which seemed to be echoing the cries of his heart for vengeance. On he swept, nearer, nearer, nearer. He was now within hailing distance, and his brain reeled; he forgot his discretion and his plan.
"Halt," he screamed, in a voice that cut the silent air like a knife.
A face appeared above the top of the buggy, and looked back. It was his foe.
With a howl of rage, he snatched a pistol from the holster and fired. The bullet went wide of the mark and the next instant he saw the whip-lash cut the air and descend on the flank of the startled mare. The buggy lurched forward, and for an instant drew rapidly away. Overwhelmed by the fear that he might be baffled in his vengeance, he drew the other pistol and fired again more wide of the mark than before.
With a wild oath he flung the smoking weapons into the road, and again drove the spurs into the steaming sides of his horse. There could be no doubt as to the result of the chase after that. The half-maddened animal was overhauling the fugitives perceptibly at every enormous stride, and in a few moments more shot by the buggy and up to the head of the terrified mare. As he did so, his rider reached out his left hand and caught the mare by her bridle, reined up his own horse and threw both of the animals back upon their haunches.