Pitcher obligation from inning to inning

[BigVic69]

Little league tournament (all stars)
 
Pitcher A finishes the 1st inning
-The obligation to pitch to one batter is met.
 
Pitcher A warms up in the 2nd
-Never pitched to a batter in the 2nd
Pitcher B comes out to replace Pitcher A
 
Q: does Pitcher A have to pitch to a batter, before Pitcher B takes over?
 
 
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[Velho]

1 minute ago, BigVic69 said:

Q2 does Pitcher A have to pitch to a batter, before Pitcher B takes over?

No.

Seems odd, I know.

[Coach Carl]

My guess is that it is to give managers flexibility due to pitch count regulations.  If you realize the pitcher will break a pitch count rule you have flexibility to remove him without breaking another rule.  Also, if you are planning pitching for future games, you can pull him to prevent necessitating another rest day and making him inelibile for a future game.