[DownTownTonyBrown]

Only allowed to come set ONCE.

NFHS/FED rules (6-1-3) say:
He shall go to the set position without interruption and in one continuous motion. He shall come to a complete and discernible stop... Natural preliminary motions such as only one stretch may be made.

6-2-4d says:
failing to pitch to the batter in a continuous motion IMMEDIATELY after any movement of any part of the body such a he habitually uses in his delivery.

Other rules/codes are similar.

As for descriptions of most motion situations, we almost always feel we Had To Be There and to see the motion.

Every pitch does not need to be delivered identically or at the same pace. However, dragging the non-pivot foot doesn't sound like a habitual motion and it doesn't sound like an immediate motion... it sounds deceptive. It sounds like BALK was the correct call.

If he is your pitcher, why was he dragging his foot?

The rule doesn't specifically say anything about you can't drag your non-pivot foot (and perhaps this is what the umpires were discussing) but the motion does sound hokey.

If the slow drag is a habitual motion, then I would feel that as soon as the drag begins, the pitcher is now committed to throw to the plate. To step off or throw to a base after the drag has begun would be a balk.

Just my thoughts but still HTBT.