Partner makes a call and you know it wasn't correct

[johnsonboys03]

Let me start off by saying I know my eyes weren't were they were suppose to be.
I was working with a guy that it was only his 5th game ever officiated. So when there was nothing going on but stillness in my primary I would glance out and see how he was doing (positioning mechanics and so forth) again I know I shouldn't have been. But anyway I see him counting on a closely gaurded situation. A1 stops his dribble and picks up the ball on I'm assuming his 3 count. I see him not switch hands which led me to expect what was next... whistle blows "5". I didn't change the call or even question him until halftime in the officials room. Correct handling?