What should the defense do if they believe a base running infraction has occurred?

When the defense believes that a base running infraction has occurred, the appropriate action is to make an appeal play to the umpire. An appeal is a formal procedure used to communicate a perceived violation of a rule, such as a player leaving a base too early or failing to touch a base. By doing this, the defense brings the situation to the umpire's attention, who can then assess the play and determine whether the infraction has indeed taken place.

Making an appeal is important because it provides an opportunity for the defense to potentially gain an out and positively influence the outcome of the game. This process is a fundamental aspect of baseball strategy and officiating, ensuring that the game is played according to the established rules.

Continuing play without interruption is insufficient in this context, as it does not address the perceived violation. Discussing the situation amongst themselves may lead to confusion and does not formally notify the umpire of their belief regarding the infraction. Requesting a time-out to discuss with the coach could delay the game unnecessarily and does not directly address the rule enforcement that may be warranted.

Thus, the option to appeal is the correct and most effective response when a base running infraction is suspected.