we should borrow the TO mechanic from Water Polo
In HS Water Polo around here each bench has an airhorn. When a coach wants a timeout he gives a quick blast. Sounds a bit comical I know, but it's actually a good system. As you can imagine in a natorium it is very loud during a game, and this way there is no mistaking what's going on. The ticket taker out in the hallway know a timeout has been requested.
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