USA TODAY Sports’ Jeff Zillgitt spoke with a number of NBA coaches who are still figuring out how exactly they will implement the leagues new challenge system. USA TODAY

Memphis Grizzlies guard Grayson Allen was ejected for channeling the Duke version of himself that made him a polarized college basketball figure. 

In a summer league game against the Boston Celtics, Allen got entangled with Celtics rookie Grant Williams and forcefully pushed him off of a backscreen to draw his first flagrant foul. Then, on the next play, Allen got lost on defense and tried to recover by making another unsafe play. As Williams went up for a lay-up off a pass from Tremont Wate,

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