And then came the _sound_--and Kazan's hatred of men burst forth in a snarl as he leaped.

There was a queer humming over their heads.

The sound from behind came again, and this time Gray Wolf gave a yelp of pain, and rolled over and over in the snow.

She was on her feet again in an instant, and Kazan dropped behind her, and ran there until they reached the shelter of the timber.

Gray Wolf lay down, and began licking the wound in her shoulder.