BROOKLYN — It’s incredible how a building’s mood can change so drastically every five minutes. From the roaring approval for Karl-Anthony Towns and D’Angelo Russell to the acidic, vitriol for the Knicks’ pick of Kristaps Porzingis, nothing satisfies a sports fan’s need for instant gratification like reacting to an NBA draft pick. But there were great moments behind the scenes that you could not see. A proud multi-generational basketball family sharing a special moment in a back room. A fashion statement that added to