over throw

[Manny A]

I can't imagine why the third base coach would argue unless he/she just didn't know the rules. As others have alluded, the award is two bases from the time the ball leaves the fielder's hand (not, as some believe, when the ball enters dead ball territory), so depending on where the runners were when the left fielder threw the ball is what you use to base your ruling.

Given this was a bases-loaded clean single, I'm thinking that when the left fielder released the throw to third, she was making a play on the runner from first base, and that the batter-runner was already past first base. So the award of third to the batter-runner would be appropriate. If, however, the play was on the runner who started at second base (hard hit ball to left, and the left fielder is making a force-play throw to third), then there's no way the batter-runner ends up at third on the award.