I had a partner from another association do this (we were working a set of rec games). Confused the heck out of me at first. He'd come in with an open hand, I'd come in with the thumbs. I'm wondering what the heck he's got that I didn't see. I guess if you know to expect it it's okay, but just out of the blue it's confusing.
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"It is not enough to do your best; you must know what to do, and then do your best." - W. Edwards Deming
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