" No military service?” “No.” “I thought not,” Reacher said. “You let us take the high ground. Which was dumb. Because thirty guys don’t mean squat if they have to come up a staircase two by two. You know we’re armed. We could pick you off like squirrels. From inside a cinder block building. Which you can’t hurt unless you’re packing grenade launchers, which I don’t think you are. So don’t come up the stairs again. Especially not in the lead. "
― Lee Child , Make Me (Jack Reacher, #20)