Clock started too early. How to correct?

[Mark T. DeNucci, Sr.]

I feel like I am beating my head against a brick wall. The game clock was started incorrectly. The sounding of the game clock's horn does not stop play in this case. The only problem is a game clock problem. You stop play at the first opportunity and correct the game clock. In this case when the player gained control of the rebound.

MTD, Sr.