No Balk ruled here. Under this circumstance this is not a deliberate act on the pitcher’s part of deceiving the runner.
Here’s another situation that you might run into.
You’ve got a runner on third, the batter steps into the box, and gets ready for your pitch. Your in the proces of going through your delivery motion when you hear the batter in a loud voice say " time! " but he stays in the batter’s box - the umpire at that moment does not halt the game … but you stop your motion.
Their third base coach point to you and says… BALK BALK BALK ! "
Did you balk – or were you set up by the batter and their third base coach to get a balk call from a rookie umpire?