Even though it wound up not mattering, I still can't get over this call. You make a correct call. You allow the batter and the manager to essentially perform a sit in until you confer with the other umpires, none of which had a vantage point that could have possibly seen whether the ball was tipped. As Jim DeShaies pointed out, you even trot in outfield umpires, who were a good football field away from the action. You then sit there and dissect various noises as though you are going through the damn Zapruder Film. Meanwhile, mind you, the home fans who are watching the replay, although admittedly biased, are reacting in a manner that makes it evident the right call was made.
I mean, let's pretend it did graze the bat. At that point, I don't think it's that big of a deal to with your original call. It's a tough call, and you may get it wrong. But to sit there and deliberate for 5 minutes and second guess your original call based on absolutely nothing is terrible.
As bad of call in an important spot as I can ever remember seeing.