5 sec CG in BC

[reffish]

Reading about the 10 sec violation that was not, I thought of a situation that happened twice to me by same partner. The first time in a boys game with shot clock, partner calls a 5 sec CG. He makes the call quick and puts the ball in play that I don't have time to discuss with him. At halftime we get together and I am able to recount the situation and he recognized his error. Next week, boys game again, calls 5 sec CG in BC. This time I run in and remind him that 5 sec in BC is not proper. He said, you're right and gave ball back to team in possession at time of call. Reading about the 10 sec that was not, should we have awarded the ball to defensive team anyway or did as we did or is this an example of incidental whistle?