re: James Harden scored on a nice slam dunk last night but the refs didn't count it (video)

From the NBA rulebook:

quote:

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• To initiate a challenge, a team must immediately call a legal timeout and the head coach must immediately signal for a challenge by twirling his/her finger toward the referees.
• If a team attempts to challenge an event with no remaining timeouts, the team is charged an excessive timeout, for which the penalty is a technical foul, and no challenge will take place.
• If a team calls a timeout to challenge an event that may not be reviewed, the team will be charged a timeout but retain its challenge.
• As with other replay reviews, in order to overturn the event as called on the floor, there must be clear and conclusive visual evidence that the call was incorrect.

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Seems pretty straightforward, and if there is video of D'Antoni during the timeout, should be easy to prove.

Call timeout, twirl your finger, done. The referees will either allow the challenge or disallow it.