I've never heard of this suggestion (counting with the arm away from the action). I personally never worry about interfering because I'm never close enough to the players to touch them. Also, when I'm counting closely guarded, I was taught to change arms when the player picks up his dribble or begins to dribble and the count resets.
Some guys make up weird stuff when asked for advice. I've certainly never seen this in a manual or heard it at a clinic.
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Cheers,
mb
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