He fastened the tent-flap so that Isobel could not escape, and left her alone, quiet and wondering. Loneliness was not new to her. Solitude did not frighten her; and, listening with his ear close to the canvas, Billy soon heard her playing with the armful of things he had scattered about her. He hurried to the dogs and harnessed them to the sledge. Couchée and his wife did not have over half an hour the start of him-- three-quarters at the most. He would run the race of his life for an hour or two, overtake them, and bring them back at the point of his revolver. If there had to be a fight he would fight. Where the trail struck into the forest he hesitated, wondering if he would not make better speed by leaving the team and sledge behind. The excited actions of the dogs decided him. They were sniffing at the scent left in the snow by the rival huskies, and were waiting eagerly for the command to pursue. Billy snapped his whip over their heads. "You want a fight, do you, boys?" he cried. "So do I. Get on with you! M'hoosh! M'hoosh!" Billy dropped upon his knees on the sledge as the dogs leaped ahead. They needed no guidance, but followed swiftly in Couchée's trail. Five minutes later they broke into thin timber, and then came out into a narrow plain, dotted with stunted scrub, through which ran the Beaver. Here the snow was soft and drifted, and Billy ran behind, hanging to the tail-rope to keep the sledge from leaving him if the dogs should develop an unexpected spurt. He could see that Couchée was exerting every effort to place distance between himself and the plague-stricken cabin, and it suddenly struck Billy that something besides fear of le mort rouge was adding speed to his heels. It was evident that the half-breed was spurred on by the thought of the blow he had struck in the cabin. Possibly he believed that he was a murderer, and Billy smiled as he observed where Couchée had whipped his dogs at a run through the soft drifts. He brought his own team down to a walk, convinced that the half-breed had lost his head, and that he would bush himself and his dogs within a few miles. He was confident, now that he would overtake them somewhere on the plain.