What's the Call? Pitching Prohibitions

What's the Call
Presented with Umpires Media

The batter squares around to sacrifice bunt, but changes his mind and pulls the bat back. The pitch hits his forearm, which is still over the plate in the strike zone. There are no outs. The pitcher is standing on the mound with their pivot foot off the rubber as he reaches up and touches his pitching hand to his mouth. Is this a balk?

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