A thirty second stare down is disrespectful, and an attempt to show-up the Referee. The whole gym sees it. It is public ridicule. It is not 'nothing'.
It is at least as disrespectful as a verbal comment that only some can hear, but that would earn the coach a T.
This act is a T in the NBA, I believe.
I would have a tough time not issuing a T for this act.
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