[U of M Sam]

I agree that if you or your umpire partner did not see the batted ball hit the batter-let the play proceed.
Don't bring attention to the play and certainly talk with your partner if coach questions the call (or lack of call) once the play is done.
A simple theroy that I apply when umpiring, especially when there is a questionable play as described: "You can change a fair ball to foul but you cannot change a foul ball (dead ball) to a fair ball".
Thanks