[illinoisbluezeb]

Had a Babe Ruth/Cal Ripken coach asking if this is legal. I believe the rule set doesn't matter.

Simple explanation below.

Runners on base.
Pitcher in set position, hands together.
Pitcher rocks back, moves hands like starting to go home and simultaneously steps back/off rubber with pivot foot.

I believe it's a balk.
If he steps off first, then rocks back it's legal.