He strained his eyes and ears, each moment expecting to hear the warning voice of the old warrior.

With a suddenness that chilled him he saw the great shadow close in upon them from the opposite side, and for the first time he realized their position.

On their left was the precipice--on their right the sheer wall of the mountain! How wide was the ledge along which they were traveling?
His foot struck a stick under the snow.

Catching it up he flung it out into space.

For a single instant he paused to listen, but there came no sound of the falling object.