Way of the Lawless by Max Brand

"Ol' Bill! " grunted red-headed Jeff. "Well, I'll be hung! There's one good deed done. He was overdue, anyways."

Andy, waiting breathlessly, watched lest the eye of the narrator should swing toward him for the least part of a second. But Scottie seemed utterly oblivious of the fact that he sat in the same room with the murderer. "Well, he got it," said Scottie. "And he didn't get it from behind. Seems there was a young gent in Martindale -- all you boys know old Jasper Lanning? " There was an answering chorus. "Well, he's got a nephew, Andrew Lanning. This kid was sort of a bashful kind, they say. But yesterday he up and bashed a fellow in the jaw, and the man went down. Whacked his head on a rock, and young Lanning thought his man was dead. So he holds off the crowd with a gun, hops a horse, and beats it."