The men at Tower Four have been working under pressure to finish this 72-story skyscraper on time. Today two alternating raising gangs will be assembling a second heavy lifting hydraulic crane to help speed up the tower’s construction. But with wind and rain in the weather forecast, it will be a battle every step of the way. Meanwhile, at Brooklyn’s only sports arena, spring rains are interfering with the day’s work; the slick, wet steel is dangerous to climb. But with a looming deadline, the men at the Barclay’s Center must brave the elements to stay on schedule.