Wearing his black-and-white Brooklyn warmups, Paul Pierce made his way into the visitors' locker room at Barclays Center before Tuesday's game, making all the rounds with a smile on his face. He chatted up Rajon Rondo in the shower area. He shook hands with team employees. He hugged and slapped hands with members of the Boston media. For a few minutes, Pierce was the Celtic legend of 15 seasons, not the opponent. But when Pierce left to go stretch, Gerald Wallace cast a stark contrast in the same locker room. The small forward, whom the Nets traded in Billy King's franchise-altering blockbuster deal with Boston, carries a different attitude about his former team.