" She said, “I can’t.” Reacher let go of Mark’s collar, and sent him sprawling with a push. He took the Glock from Patty. He said, “I wanted you to have the opportunity. That was all. Otherwise you would have wondered all your life. But now you know. You’re a good person, Patty.” “Thank you.” “Better than me,” he said. He turned and shot Mark in the head. Twice. A fast tight double-tap, low in the back of the skull. What the army schools called the assassination shot. Not that they would ever admit it. "

― Lee Child , Past Tense (Jack Reacher, #23)