Burton struck out, without warning, straight from the shoulder.

Thornton was sent spinning, and saved himself from falling only by clutching the rail of the bar.
Those who were looking on heard what was neither bark nor yelp, but a something which is best described as a roar, and they saw Buck's body rise up in the air as he left the floor for Burton's throat.

The man saved his life by instinctively throwing out his arm, but was hurled backward to the floor with Buck on top of him.

Buck loosed his teeth from the flesh of the arm and drove in again for the throat.

This time the man succeeded only in partly blocking, and his throat was torn open.
Then the crowd was upon Buck, and he was driven off; but while a surgeon checked the bleeding, he prowled up and down, growling furiously, attempting to rush in, and being forced back by an array of hostile clubs.