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Originally Posted by AtlUmpSteve
It is a violation of the lookback rule in the sequence you describe; that the pitcher has possession of the ball in the circle before the runner leaves the base. If the runner starts while the ball is in the air to the pitcher, that is a legal advance.
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A minor addition, if multiple runners violate, only one can be out for RCR/LBR violation. Usually the earliest one to leave the base.