How to prevent double calls

[bossman72]

How do you guys prevent double calls in these situations since it's not something typically gone over in a quick pregame:


1) There is obstruction on R2 going home on a fly to right after tagging up (or on any play at the plate for that matter- this play is just an example). How do you as the plate umpire not bang the runner out when he's tagged and then have to reverse yourself when he scores on the obstruction? Or if your the BU, what do you do (other than the delayed dead ball signal) to let the PU know an obstructed runner is coming home.

2) There is a missed base appeal at third or first. How do you prevent you and the other ump making different calls at the base. When the defense goes through the appeal process, do you have any little signals with your partner to say who's call it is?



Like i said originally, this isn't something that people in my assoc go over a whole lot in pregames. Do any of you cover these things in your pregame?