Mercedes screamed.

Charles looked on wistfully, wiped his watery eyes, but did not get up because of his stiffness.
John Thornton stood over Buck, struggling to control himself, too convulsed with rage to speak.
"If you strike that dog again, I'll kill you," he at last managed to say in a choking voice.
"It's my dog," Hal replied, wiping the blood from his mouth as he came back.

"Get out of my way, or I'll fix you.

I'm going to Dawson." Thornton stood between him and Buck, and evinced no intention of getting out of the way.

Hal drew his long hunting-knife.