What should the umpire note if B1 attempts to check his swing and carries the bat barrel past his body?

When a batter attempts to check their swing and carries the bat barrel past their body, the umpire's primary focus is on the intent behind the swing. Noting whether the barrel was carried with the intention of hitting the ball is crucial because it helps determine if the batter indeed swung at the pitch. This aspect is vital for making a call on the pitcher's delivery and assessing whether a strike or ball should be called.

If the umpire observes that the bat barrel was carried in an attempt to hit the ball, it signifies an attempted swing, which would indicate a strike. On the other hand, if it appears the batter did not intend to swing, it would not count as a strike. This assessment is key in maintaining the fairness and integrity of the game, as it clarifies the batter's intentions and ensures the proper ruling on the pitch. Therefore, focusing on whether the barrel was carried with the intent to hit aligns perfectly with the rules governing swings and checks in baseball.