Damn good thing that Zack wasn't the average human. His reflexes were sharp, so he had more than enough to account for how fast the thing was coming. So it was that he was close enough to knock the thing up in the air, getting it to bounce just enough for him to set himself under the ball and give it just a bit of a bounce. Just enough for it to barely cross over into what Zack had decided was Tidus's side of the game. First rule, make the opponent use more energy than you do.