Six players on the court

[Adam]

Originally Posted by Wellmer

It would be safe to say then that if we wouldn't have had an inadvertant horn, the sub wouldn't have come in. Usually when the horn sounds everyone stops, for at least a split second anyway. Using common sense, I would go explain that even though the horn sounded, it was too late and I would keep the sub out. I understand since you have a dead ball now that the sub in all rights should be able to come in but from a teaching standpoint, I would keep him out because rightfully if everything had gone correctly, he should not be on the floor yet

Fixed it for you. If you're in some sort of teaching environment, ok. I've found the kids learn just as quickly when I enforce the rules as written; tell the thrower to play on. In the video, I'd have gone with the T (assuming I didn't slow down seeing the sub come in).
The biggest lesson needed is for the player to know he has to wait until the refs tell him he can come in. One T and he'll never forget. A talk from the official? He'll forget by the next morning.