Nah, it's a pretty standard technique when getting someone to chose between two things in a trick.
He didn't say in advance what he was going to do with the chosen half, so could either say that the half selected contains the ace or that it contains the card indicating the ace's position in the other half.
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Happosai _,,,,_(O ; o)_,,,, Sun 12 Jul 2020, 12:12,
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