Dentonump,
There is no rule prohibiting the R2's actions. As long as he is not interfering with the F6's attempt to field the ball (which would require a ball in motion in his general direction) or avoiding a tag attempt, the runner can go pretty much where he pleases.
As Orioles suggests, the F6 should just pull the R2 far enough away from the bag that he's easy meat for a pick-off.
JM
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