Lad did not chew aimlessly at the thick tether; nor throw away one ounce of useless energy. Seizing the hempen strands, he ground his teeth deeply and with scientific skill, into their fraying recesses. Thus does a dog, addicted to cutting his leash, attack the bonds which hold him.
It was Lad's first experience of the kind. But instinct served him well. The fact that the rope had been left out of doors, in all weathers, for several years, served him far better. Not only did it sever the more easily; but it soon lost the cohesion needed for resisting any strong pull.
The bear, lurching half-blindly, had reeled out into the open, below the knoll. There, panting and grunting, he turned to blink at the oncoming fire and to get his direction. For perhaps a half-minute he stood thus; or made little futile rushes from side to side. And this breathing space was taken up by Lad in the gnawing of the rope.
Then, while the collie was still toiling over the hempen mouthfuls, the bear seemed to recover his own wonted cleverness; and to realize his whereabouts. Straight up the hillock he charged, toward the lean-to; his splay feet dislodging innumerable surface stones from the rocky steep; and sending them behind him in a series of tiny avalanches.
Lad, one eye ever on his foe, saw the onrush. Fiercely he redoubled his efforts to bite through the rope, before the bear should be upon him. But the task was not one to be achieved in a handful of seconds.
Moving with a swiftness amazing for an animal of his clumsy bulk, the bear swarmed up the hillock. He gained the summit; not three yards from where Laddie struggled. And the collie knew the rope was not more than half gnawed through. There was no further time for biting at it. The enemy was upon him.
Fear did not enter the big dog's soul. Yet he grieved that the death-battle should find him so pitifully ill-prepared. And, abandoning the work of self-release, he flung himself ragingly at the advancing bear.
Then, two things happened. Two things, on neither of which the dog could have counted. The bear was within a hand's breadth of him; and was still charging, headlong. But he looked neither to right nor to left. Seemingly ignorant of Lad's presence, the huge brute tore past him, almost grazing the collie in his insane rush; and sped straight on toward the lake beyond.
That was one of the two unforeseen happenings. The other was the snapping of the rotted rope, under the wrench of Lad's furious leap.
Free, and with the severed rope's loop still dangling uselessly from around his shaggy throat, the dog stood staring in blank amaze after his former adversary. He saw the bear reach the margin of the icy lake and plunge nose deep into its sheltering waters. Here, as Bruin's instinct or experience had foretold, no forest fire could harm him. He need but wallow there until the Red Terror should have swept past and until the scorched ground should be once more cool enough to walk on.