Quote Originally Posted by Ilyn
Oh, neat! Once, Lulu was petrified, and Yuna threw the ball instead. I wonder what happens if one of them is dead...
The ball is passed to the girl with the second-highest affection rating, and if she's unavailable, it goes to the third. If none of the girls are available, then the ball comes out of thin air.

EDIT: Oops, Aurons Ghost already addressed this.