The Hair-Trigger Kid by Max Brand

To think of this matter calmly and from a distance, there was nothing strange in the fact that the Kid had just implied that he had killed four men, one after another. He had a reputation that attributed stranger and more terrible deeds than this to him. But to be there in the quiet of the woods alone with him was another matter. The friendliness in his blue eyes upset her. And then he seemed amazingly young. There was not a trace of a wrinkle about his eyes, and the only line in his face was a single incision at the side of his mouth which appeared, now and then, when the rest of his features were gravely composed, and gave him a look of smiling cynically to himself. Whatever cruelties and desperate actions he was guilty of, it seemed also manifest that he was as generous as cruel, as manly as fierce.

Then, suddenly, she asked him: "Did you kill all of those men?"