[blueump]

This is something I always communicate with my partner (if I haven't worked with him before, and sometimes even if I have) BEFORE the game ever starts:

It is improper to ever "over-rule" any umpire, unless they ask for your help. If the call at first base is your call, it stays your call unless you ask for help.

How would I handle it? Between innings, I would gently approach my partner (he'd know something was up, cause I wouldn't be where I belonged during the inning change) and tell him that he ever over-ruled a call of mine again, without me asking for help, he'd be finishing the game ALONE!

JMHO