[johnnyg08]

Here's the entire MLBUM interp.

I'll take some time to type out what's written in the MLBUM to alleviate any potential confusion.

7.12 Trips to the Mound

A second trip to the mound to remove the pitcher in the same inning by a manager or coach will cause that pitcher's removal from the game.

The manager or coach is prohibited from making a second visit to the mound while the same hitter is at bat, but if a pinch hitter is substituted for this batter, the manager or coach may then make a second visit to the mound, but must then remove the pitcher.

For the purpose of this rule, a batter's time at bat begins the moment the previous batter is put out or becomes a base runner

A trip to the mound begins when the manager or coach crosses the foul line. The trip ends when the manager or coach leaves the 18 foot circle surrounding the pitcher's rubber.

A consequence of the rule regarding trips to the mound is that once a manager or coach has completed a trip to the mound, the pitcher then pitching must continue pitching to the batter then at bat (or retire the side) unless a pinch hitter is substituted or unless one of the following situations applies:

a. If a game becomes suspended during a manager's or coach's trip to the mound (or after the trip but while the same batter is still at bat), a new pitcher may be substituted when the game is later resumed.

b. If a rain delay occurs during a manager's or coach's trip to the mound (or after the trip but while the same batter is still at bat), a new pitcher may be substituted when the game is resumed following the rain delay.