When can a batter leave the batter's box without penalty?

A batter is allowed to leave the batter's box without penalty when the umpire calls time out. This scenario includes various situations where time is officially called, such as an injury, a player needing to discuss something with the coach, or any circumstance where the game momentarily stops.

In contrast, a feint by the catcher, a strike thrown by the pitcher, or a runner stealing a base do not inherently allow the batter to step out of the batter's box. The batter must remain in the box until they have permission or a valid reason, like the umpire calling time, to leave. This rule ensures the game maintains its pace and integrity, as unexpectedly leaving the box could disrupt play or provide unfair advantages.