He was fighting to get _under_, as he had flung himself under the caribou he had disembowelled.
Again and again Thor buried his long fangs in the other's flesh; but in fang-fighting the black was even quicker than he, and his right shoulder was being literally torn to pieces when their jaws met in midair.

Muskwa heard the clash of them; he heard the grind of teeth on teeth, the sickening crunch of bone.
Then suddenly the black was flung upon his side as though his neck had been broken, and Thor was at his throat.

Still the black fought, his gaping and bleeding jaws powerless now as the grizzly closed his own huge jaws on the jugular.
Muskwa stood up.

He was shivering still, but with a new and strange emotion.

This was not play, as he and his mother had played.