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.