Well you didn't! At least not the FC side of it (the Etiquette).
In that case I'll try again. Players must not play a shot when their caddie, playing partner, or playing partner's caddie are standing on or close to the line of play or line of putt, behind the ball. To do so incurs a 2-shot penalty in strokeplay or loss of hole in matchplay.
Fellow competitors can stand where they like, subject to good etiquette, It is not good etiquette to stand close to or behind a player's line of play, but there is no penalty as such for doing so.
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