But as the hours passed, it became increasingly difficult to forget the wolf pack. It was only a matter of turning the head and peering for an instant into the shadows to catch a glimpse of one of the creatures. Their forms, when they emerged from the shadows of the tree trunks, were entirely visible against the snow. They no longer yapped and howled. They acted very intent and stealthy. They had spread out in a great wing, slipping from shadow and shadow, and what were their mental processes no human being may even guess. It was a new game; and they seemed to be seeking the best means of attack. Their usual fear of men, always their first emotion, had given way wholly to a hunting cunning: an effort to procure their game without too great risk of their own lives. In the desperation of their hunger they could not remember such things as the fear of men. They spread out farther, and at last Dan looked up to find one of the gray beasts waiting, like a shadow himself, in the shadow of a tree not one hundred feet from the sled. Snowbird whipped out her pistol. "Don't dare!" Dan's voice cracked out to her. He didn't speak loudly; yet the words came so sharp and commanding, so like pistol fire itself, that they penetrated into her consciousness and choked back the nervous reflexes that in an instant might have lost them one of their three precious shells. She caught herself with a sob. Dan shouted at the wolf, and it melted into the shadows. "You won't do it again, Snowbird?" he asked her very humbly. But his meaning was clear. He was not as skilled with a pistol as she; but if her nerves were breaking, the gun must be taken from her hands. The three shells must be saved to the moment of utmost need. "No," she told him, looking straight into his eyes. "I won't do it again." He believed her. He knew that she spoke the truth. He met her eyes with a half smile. Then, wholly without warning, Fate played its last trump. Again the wilderness reminded them of its might, and their brave spirits were almost broken by the utter remorselessness of the blow. The girl went on her face with a crack of wood. Her snowshoe had been cracked by her fall of the day before, when running to the fire, and whether she struck some other obstruction in the snow, or whether the cracked wood had simply given way under her weight, mattered not even enough for them to investigate. As in all great disasters, only the result remained. The result in this case was that her snowshoe, without which she could not walk at all in the snow, was irreparably broken. VI "Fate has stacked the cards against us," Lennox told them, after the first moment's horror from the broken snowshoe.