Reaching out of your area

[LRZ]

To some extent, this depends on who your partners are (familiar or never worked together before?) and what you pre-game. I only work 2-ref, and my pre-game always includes this: "I'm not territorial, so if you clearly see a foul in my primary, call it. Let's get it right."

I also disagree with this: " I've been told that it would be more appropriate to let him deal with the consequences of missing a call if he messed it up." The officials are a team, and the team bears the responsibility to get foul calls right. Don't guess, but if 100% sure? If I were your partner, I'd rather you make that call. Maybe I was straight-lined; maybe I was looking up top and could not see lower body contact.

IMO/YMMV.