horn?

[just another ref]

Situation: Boys varsity in a small, loud gym. Tie score with 7 seconds left.
Visitors inbound under opponent's basket following a timeout. There is a long pass to near the division line which is deflected back and forth approximate a hundred and twenty three times. (hey, it's my story.....and I said approximately) Players are spread the entire length of the court. Two whistle crew. I am trail. Visitors finally pull in the loose ball, there is a pass ahead and A1 goes up to lay it in. I steal a glance at the clock, which is over my left shoulder, as he releases it reads :01. Ball goes in, I look to the home coach for a possible timeout signal, there was none. Meanwhile, a player had requested and been granted a timeout by my partner. The clock now reads 0:00. This clock does not show tenths. I did not hear the horn, but neither did I hear my partner's whistle, which he assures me he did sound. I thought the game was over. I now believe that the fact is that NOBODY in the building knew whether the horn had sounded or not, let alone whether it was before or after the player signaled timeout. What would you have done?