Head coach late arrival to game

[johnny1784]

At the beginning of an AAU tournament game, Team A had only one coach on their bench. With approximately 6 minutes remaining, another adult, coach #2 sat down at Team A's bench. Coach #2 rose off his seat in a demonstrative manner with hands in the air to protest a no-call. A game official gave coach #2 a Bench Technical for violating head coach-box and challenging a referee. Coach #2 insisted that he is the head coach but the official informed him he was not on the bench at the start of the game nor was he in the book as the head coach and there was no communication from coach #1 that coach #2 has become the head coach.

Does anyone know where to find clarification or ruling in our NFHS books or NCAA online?

Please state your opinion and location of your findings.