holding my receipt in front of me in one hand like this , bob saidand i could hear the paper flap in the darknessand keening back on one heel like this , said boband i could hear dust grinding against the tiling under his shoei swung my other arm and lega rustleand pivoted through a complete 360 degree turn like this -- ( there was a shuffle , a flap , a very soft whoosh , a final tap and scrape and then silence , slightly labored breathing , and then silence .