[Rich Ives]

Originally Posted by bbman

3 person.
No one on base.
Batter bunts down the third base line (kind of a little pop up). Third baseman comes in and dives for the bunt, near the line but in fair territory, ball gets touched in fair territory by the third baseman, then rolls foul. Plate ump calls foul ball. Coach challenges the call. Plate ump calls third base ump over to discuss. After short discussion, plate ump changes his call to fair ball.
Is this correct procedure?

Yes.

And as described it was a fair ball.