One continuous motion

8.01 (OBR) requires, for the Set Position, that "Preparatory to coming to a set position, the pitcher shall have one hand on his side; from this position he shall go to his set position as defined in Rule 8.01(b) without interruption and in one continuous motion.

Note that there is NO BALK penalty associated with this passage of the code, nor one that I can discern in 8.05!

So, how do we enforce the part of the code "...in one continuous motion..." if the pitcher, from his preliminary position taking signs from the catcher, starts up to go to his Set Position, then stops, PRIOR to becoming set, and goes back down to take more signs, or other reason. He has interrupted his continuous motion from the preliminary position to the Set Position. If you elect to call a balk, then under which paragraph of the rules, or rules interpretation reference, do you cite for enforcement.