What is the outcome when B4 steps out of the box while F1 is in motion and requests a timeout?

In this scenario, when B4 steps out of the box and requests a timeout while F1 (the pitcher) is in motion, the pitcher is typically not allowed to respond to the request for timeout until the ball is in the pitcher's possession. If the pitcher delivers the pitch while B4 is stepping out, the pitch is considered valid.

If B4 is out of the box at the time the pitch is thrown and did not return in time to be considered actively participating in the at-bat, the outcome can result in B4 being charged with a strikeout. This is consistent with the rules that state a batter must be properly in position to play and cannot easily interrupt the flow of the play at that moment.

In this instance, the correct answer reflects the consequences of B4's actions in relation to the rules of the game regarding the batters' conduct during the pitch.