Must agree with West Michigan Blue. For all High School games and most ASA, D2 and D3 college games, my wife and I work together and rarely ever have a problem. Despite us being married we have a lot of fun
. However, we communicate constantly even on the most routine stuff.
When we are assigned D1 games, we are expected to communicate on the field....Even on the most basic simple play. It looks good, gives the coaches the impression that we are on the ball, and provides confidence for each of us.
My point I guess is this, you should communicate with your partners even if you work with them regularly. Soon it will become habit and will save you that 1 time you are with a stranger and all hell breaks loose.