My rule of thumb is that off-ball calls out of your primary are OK, but stay away from the on-ball calls outside of your primary. Getting an illegal screen or a chuck of the cutter or other similar plays are great calls to make - even if it's not in your little diagrammed area. Where we get in trouble is when we start making on-ball calls outside our area - the fouls on blocked shots clear across and outside the key, the handchecking call clear across the court, the phantom tripping call above the three point line (sorry, couldn't resist).
The first examples I gave can be great "crew calls". The second set are great "crew killing" calls.
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