The first round of the NBA playoffs is in the books , and not without some surprises. Boston is out (big one), Houston, too (less so) and injuries, a story in the first round, figure to play a role in the second. With the conference semifinals kicking off on Monday, let’s look at five burning questions about this stage of the postseason Can the Knicks seize the moment?  Dateline, April 23: The Knicks are down 2–1 to Atlanta. Mikal Bridges is getting flamed. Mike Brown is getting fired. Legions of New Yorkers had taken to the trade machine to figure out what the Knicks would have to give up to land Giannis Antetokounmpo.  Two weeks later, all is right in Knicks-land. Bridges made shots in the final three games of the Hawks series. Brown made adjustments. And no one wants to trade Karl-Anthony Towns right now, for Antetokounmpo or anybody for that matter. Can New York build on that? Boston’s ouster has cleared the field of a formidable opponent.…