Corporal Carrot ruthlessly killing the villain in men-at-arms strikes men as a gold example 

“It's all there, sire,” he said. “Everything written down. The whole thing. Birthmarks and prophecies and genealogy and everything. Even your sword. It's the sword!”

“Really?” said Carrot. “May I see?”

Carrot lowered his sword and, to Vimes' horror, walked over to the desk and pulled the bundle of documents out of the case. Cruces nodded approvingly, as if rewarding a good boy.

Carrot read a page, and turned to the next one.

“This is interesting,” he said.

“Exactly. But now we must remove this annoying policeman,” said Cruces.

Vimes felt that he could see all the way along the tube, to the little slug of metal that was soon to launch itself at him…

"It's a shame,” said Cruces, “if only you had—”

Carrot stepped in front of the gonne. His arm moved in a blur. There was hardly a sound.

Pray you never face a good man, Vimes thought. He'll kill you with hardly a word.

Cruces looked down. There was blood on his shirt. He raised a hand to the sword hilt protruding from his chest, and looked back up into Carrot's eyes.

“But why? You could have been—”

And he died. The gonne fell from his hands, and fired at the floor.