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DALLAS, UNITED STATES - NOVEMBER 3: Dirk Nowitzki (R) of Dallas Mavericks reacts to official during the NBA basketball game between Boston Celtics and Dallas Mavericks at the American Airlines Center in Dallas, Texas, on November 3, 2014. (Photo by Bilgin Sasmaz/Anadolu Agency/Getty Images)

DALLAS, UNITED STATES - NOVEMBER 3: Dirk Nowitzki (R) of Dallas Mavericks reacts to official during the NBA basketball game between Boston Celtics and Dallas Mavericks at the American Airlines Center in Dallas, Texas, on November 3, 2014. (Photo by Bilgin Sasmaz/Anadolu Agency/Getty Images)