Mistaken clock not starting error

[Dan_ref]

Originally posted by Jurassic Referee

PS- just for the record, in real life I'd do what Tony said to do too. Sell it quickly and get the ball back into play with a repeat throw-in. That's the fair way.

Maybe I'm missing something.

A1 successfully throws the ball in from the end line to mid court. The game ending horn erroneously sounds. You decide to take A allllll the way back to the endline again.

How is this fair to A again?