Cover it in your pre-game! Find out what each official's philosophy is. If your partner is unfamiliar with you and/or you with him, tread lightly outside of your primary no matter what he/she says.
If something happens outside your area, and you see it, MAKE the call. Then, be the one that starts the conversation, "On that call I made in your area, I was 100% and..."
No matter what his "philosophy" is, you will then find out if he lied to you or not (i.e., does he REALLY care if you call something in his primary area, or not, if you are sure you saw it?) If he is receptive, continue on, if not, be careful. Even if my partner wasn't receptive to it, I'd tell him I'm still gonna make a call that I'm 100% sure on. My philosophy is "to get it right, regardless how we look."
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