John slays the bear cubs


John rushes to the throat of the cub


And squeezes as hard as he can with his teeth (the cub whimpers in his pain)


After this...


..John throws him in the air


And breaks his neck


John attacks the other cub and sinks his teeth in the throat


A common effect: "Blood spills"


Finally he pulls himself off the cub, and blood spills from the dogs mouth, which he seems to enjoy.