Over and back -correctable call

[Jim Henry]

Last season I’m doing a middle school game and at opening tip-off Team B gets ball in their front court but goes the wrong way towards their basket and crosses center line. B Coach yells and the B player turns and goes back into their frontcourt. They shoot and miss and A gets rebound. Meanwhile A Coach is yelling over and back for the first play. I blow my whistle, stop play, and ask my partner for advice. He said too late to correct. We give ball back to A to inbound and the game continues.

First time in 5 years, I have seen this. Neither my partner nor I made the call for over and back violation. I think we were both too caught up in the moment. We obviously blew the call. Is this a correctable error? Should I have done anything differently? What if Team B scored after we missed the call?