Pick off from the Windup

[grogdog]

LL Juniors
We tried a pickoff at 1st from the windup tonite. The pitcher was on the rubber with hands together then made a unmistakable step towards first and threw over. The ump balked him because he did not disengage. I said he didn't have to disengage according to the rulebook and our UIC (they were our umps). I even showed him the ruling from our UIC. Then he said he'd balk him everytime because he's "deceiving" the runner by standing on the rubber with his hands together. At any rate, he said he balked him because he didn't disengage so my question is can his ruling (reason for the balk) be protested?

Thanks