Mistake...

[just another ref]

Originally Posted by showbo

I HEAR Team B coach yell 'time-out' split second later Team A player contested the ball, I blow whistle and call held ball.

As my esteemed colleague points out, from your description this indeed may have been a travel. But if it was not, sounds perfectly all right to me. You say you called held ball, but apparently you mean you signaled held ball, but then granted the timeout instead because in your judgment it occurred first. A mechanical mistake to be sure, but better to get the call right. A signal alone means nothing.