One thing you might think about is asking the kicker, (when you hand him the ball before the free kick), if he is "kicking away" or not? If he says, "onsides" then you're clued in, and if you have a pre-arranged signal then the rest of your crew will be clued in as well.
As a HL, I ask this question before every free kick, regardless of the situation.
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kentref
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