FED 6-1-3
.....the pitcher may TURN on his pivot foot or LIFT it in a jump turn to step with the non-pivot foot toward a base while throwing or feinting .... or he may LIFT his pivot foot in a step backward.
Now, I have NEVER seen a pitcher who stepped with his non-pivot to first keep his ENTIRE pivot foot in contact with the rubber. This would be such an awkward move, I don't anticipate ever seeing it. If I am visualizing this move correctly, the only way it could be interpreted a balk is if it violated not turning his pivot.
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