Here's a post from another forum on the mechanic. Can anybody say with certainty or any other AO that this would be wrong?
The "push sign" is a standard mechanic that umpires will use to convey the coach's interference. It not unlike the safe off the bag mechanic or the out of the baseline mechanic. It is just a signal to communicate to everybody watching why he made the call.
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It's like Deja Vu all over again
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