How should the umpire respond when switch-hitting B1 changes from left-handed to right-handed hitting?

When B1, a switch-hitter, changes their batting stance from left-handed to right-handed, the umpire's response should reflect the rules regarding fair play and the pitcher’s position. In this case, calling "Time" and requiring the pitcher to pitch from one side is crucial to maintaining the integrity of the game.

This response is based on the principle that the pitcher must be prepared to face the batter from the required side according to the batter's stance. When a switch-hitter changes sides, the pitcher must also adjust, because the dynamics of the pitch and the batting angle differ significantly between left and right-handed players. This ensures that both the pitcher and the batter are playing under equal conditions, as a left-handed hitter might have a different advantage against a right-handed pitcher compared to a right-handed hitter facing a left-handed pitcher.

Allowing B1 to bat freely without adjusting the pitcher's position could create an uneven playing field, undermining the fairness of the game. This is why it is necessary for the umpire to intervene by calling "Time" and requiring the pitcher to pitch from the appropriate side corresponding to B1's stance.