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Burton was assessed a flagrant foul and got ejected for elbowing [Kevin] Parrom in the face near the baseline with 10:25 remaining. Burton walked back to his bench claiming he got hit. Arizona fans chanted "Throw him out!" as the referees reviewed the play.
The Beavers trailed by nine when Burton left the court. Parrom scored six of the Wildcats' next nine points, with Williams adding his fifth 3-pointer to extend the lead to 70-56.
Freshman guard Roberto Nelson, one of the few who did make bed check Thursday, exploded for a career-high 34 points, evoking memories of his days with his Compton Magic AAU team.
Among the players who were disciplined were usual starting guards Jared Cunningham and Ahmad Starks, starting forward Devon Collier, and key reserves Calvin Haynes and Lathen Wallace.
Nelson quipped, "I'm a boring guy" when a reporter asked him why he wasn't out with everyone else.