From the first hour he set his feet on the trail to the sheep country this culmination of his adventures had been shaping. Little by little it had been building, the aggression pressed upon him, his attitude all along one of defense. Perhaps when trouble is heading for a man, as this was inevitably directed, the best thing to do is rush to meet it with a club in the hand. That was the way it looked to John Mackenzie that evening. Trouble will put things over on a man who is bent to compromise, every time. Undoubtedly it looked that way. But he had killed a man. It was a heavy thing to carry on his soul. This depressing shadow thickened over him as the sun drew down to the hills, and he went working his flock slowly to the night's bedding-ground. The complaint of the lambs, weary from following and frisking the day through, was sadder to him than it ever had fallen on his ears before. It seemed a lament for the pollution of his hands in human blood, moving a regret in his heart that was harder to bear than fear. Mackenzie sat above the resting sheep as the shadows drew toward him between the hills, a glow as of a distant city where the sun went down an hour past. The rifle was beside him, his pistol in his belt, for regret of past violence would not make the next hour secure. If trouble should lift its head in his path again, he vowed he would kill it before it could dart and strike. No, it was not a joke that Reid had pulled on him that afternoon. Reid had meant to rob him, urged on to the deed by his preying discontent and racking desire to be away. Reid was on his way out of the country now, and if they caught him and took him before the judge who had sentenced him to this unique penance, he would have the plea that Mackenzie drove him out, and that he fled to save his life. That might be sufficient for the judge; certainly it would be enough for Tim Sullivan. Sullivan would bring him back, and Mackenzie would be sent to pick up the trail of his fortunes in another place, with years of waiting between him and Joan, perhaps. So Mackenzie sat with his moody thoughts, depressed, downhearted, regretting bitterly the necessity that had risen for taking away a fellow-creature's life. It bore on him heavily now that the heat of his blood had subsided; it stood before him an awful accusation. He had killed a man! But a man who had forfeited his right to live, a man who had attempted to take his life in the past, who had come again that day to hunt him like a coyote on the hills. The law would exculpate him; men would speak loudly of his justification. But it would stand against him in his own conscience all his days. Simple for thinking of it that way, he knew; simple as they held him to be in the sheep country, even down to old Dad Frazer, simplest among men.