" Ok," he says. " First lesson." Noah broadens his stance, taking his place firmly on the embassy side of the threshold. " in the United States," he says. Then, with both feet, he leaps on to the sidewalk. " Out of the United States." Quickly, he jumps back toward me. " In the United States." Another jump across the threshold. " Out of the United States. In. Out. In --" " Is this the part where I hit you? "