Reaching out of your area

[ballgame99]

Last night I am C, not much going on in my PCA, last second shot at the end of the 3rd quarter, 3 point shot goes up just below the FT line extended, which just happened to be directly across the court from me and my line of sight. (IE I have a great angle). I take a glance at it. I see the defender CLEARLY foul the shooter across the arm. I KNOW this is a foul, but I also know this is not my call. I wait, expecting a whistle from the trail, shooter comes all the way down, no whistle from Trail... I blow. Neither coach says a word, not even a groan from the crowd. Everyone saw this foul. Coach of the shooter actually commented that this was a great call (because he knew it wasn't my call to make but I did anyway).

Needless to say my partner wasn't happy.

When is it appropriate to reach out of your area? Does it have to be a flagrant or technical foul situation? Am I the worst partner ever? I've always read on here that you don't come that far out of your PCA unless it is a "crew saver". I felt like this fit the bill.