It doesn't matter. If that outfielder thinks he caught the ball, and the umpire calls the batter "out", but the batter continues to run to first base, should the batter be safe? Of course not. Out is out. But...he has to see or hear him call him out before he does anything with the ball. Paul rolled the ball to the mound before the out was called. No, he doesn't have to see or hear ANYTHING before he does anything with the ball. If the fielder is certain that he caught the ball, then he probably won't even look at the umpire. You are kidding right? You can not assume things like that. Sure you can. It happens 99% of the time. Fielders rarely look at the umpire for the call, because they know what the call will be. I don't know about 99% of the time but they should always make sure. It's a game with humans and they make mistakes and it's the jobs of the players to do what they can to avoid it being a multiple mistake. No, it's the players' job to play the game by the rules, to the best of their ability. It's the umpire's job to apply the rules. The rules weren't applied. It wasn't a "mistake" by the umpire. He got the call right, and then changed his call, which is unheard of. It was a blatant violation of the rules by an umpire........... you can't put that on the players, no matter how you twist it. Really? So if one ump calls it an out and the other calls it a hit the OF should always assume it's an out? There is no clock in this game so what's the hurry to get a 3rd out? You have to make sure it's an out and if you assume you have a chance of getting burnt.