inputs: hypothesis: Bloomberg has been mayor twice. premise: As he campaigns for a third term, Mayor Michael R. Bloomberg is counting on his reputation as a top-notch manager who tamed a once-unruly metropolis. Yet to remarkable degree, the task of managing New York City over the last four years has fallen to Mr. Skyler, a lanky 35-year-old former Ivy League fencer and "Star Wars" buff who once tackled a mugger who was trying to steal a cellphone in Midtown Manhattan. When a steam pipe exploded near Grand Central Terminal in 2007, it was Mr. Skyler who coordinated the cleanup.