| Quote #1
In quick rage he sprang at the man, who met him halfway, grappled him close by the throat, and with a deft twist threw him over on his back. Then the rope tightened mercilessly, while Buck struggled in a fury, his tongue lolling out of his mouth and his great chest panting futilely. Never in all his life had he been so vilely treated (1.10)
Violence is something new for Buck; it was not a part of his old life.
| Quote #2
The kidnapper undid the bloody wrappings and looked at his lacerated hand. (1.19)
Buck responds to violence with violence.
| Quote #3
But he was thrown down and choked repeatedly, till they succeeded in filing the heavy brass collar from off his neck. (1.21)
Resistance on Buck’s part is met with further violence.