When does a Player assume pitching duties

[IRISHMAFIA]

Originally posted by Rattlehead
Defensive team is entering the field, Third Baseman picks up game ball and starts goofing off with the ball in the circle. She even acts like she is going to pitch the ball but does not ever throw the ball to the catcher. She then hands the ball the pitcher and then starts to third.

PU then says that she must deliver one pitch because the player is now the pitcher.

I looked (Skimmed)for it but I couldn't find the rule.

Doesn't the player have to throw a warmup pitch to be considered a pitcher sub?

Speaking ASA, cannot speak for other sanctioning bodies.

Umpire is an idiot. Anyone can pitch at anytime save a player which was removed from that position by rule. A pitcher is NOT required to pitch to any batter, nor throw warm-ups to the catcher if they choose not to.