To uphold or deny?

[UmpJM]

Originally Posted by dash_riprock

Unless he is attempting to confuse the defense or make a travesty of the game, his retreat to 2nd is legal.

dash,

I would disagree.

Once a runner legally attains a base, and the pitcher subsequently delivers a pitch (or even engages the rubber with possession of the ball in preparation to make a subsequent pitch), the runner may NOT retreat to a previous base for any reason. (7.01 Comment).

I agree with mbyron's assertion.

JM