In the case where the runner misses a base but initiates a return, what is the defense required to do?

When a runner misses a base but makes an attempt to return, the defense has the responsibility to tag the runner with the ball to record an out. This rule exists because, even though the runner is attempting to rectify the mistake by returning, they are still considered to be in jeopardy of being put out until they successfully touch the missed base or until the defense effectively tags them.

The action of tagging the runner creates a clear and direct consequence for the mistake. If the runner is tagged before they reach the base, they are out, which serves to enforce the rule of base touch compliance. This dynamic keeps the game fair and maintains the importance of following the established base running rules.

Allowing the runner to return safely or only touching the base does not address the situation; the runner still holds the risk of being declared out. Requesting time first is unrelated to the situation as the play is still active while the runner is attempting to return. Therefore, tagging the runner is the definitive action required by the defense in this scenario.