Courtesy Runner Etiquette

[bob jenkins]

Originally Posted by CT1

This is not an illegal substitution, since CRs must be eligible substitutes. It's an unreported substitution. The CR is now in the lineup, and the P or C has been out of the game once and can reenter.

However, this can't take place in the same half-inning.

2-36-3g "An illegal substitute is a player who violates the courtesy runner rule." See also case CR1.

IOW, onetime is correct that it's a illegal substitute.

So, yes, stop it. IF it's not stopped, then the player is out and restricted. THe opposing coach doesn't need to wait for a pitch before asking about it (but if he asks "too early" then there's the risk that the umpire wil just change it in the name of game management -- so I'd at least wait for the ball to become live).