the oncoming headlights hurt mary's eyes. she is getting sleepy and her vision is blurring. her eyes close, involuntarily, snap open again. she stretches than wide, as if forcing them to stay open. the oncoming lights seem to glare to a point beyond endurance. she murmurs "sam - sam." she is quite shaken, realizes she caused herself a great deal of trouble and placed herself in unnecessary danger. she is disturbed and angry and frightened at her inability to act normally under the pressure of guilt. as she drives, she glances into her rear-view mirror. she glances out at her surroundings. she checks her mirror. she breathes a sigh of relief, thinks a moment, makes a quick decision.