overtun a call, fumble

[Judtech]

It was the great philosopher Chevy Chase who stated in the movie "Fletch Lives!" : It takes a big man to admit when he is wrong, I am NOT a big man!"

Your partner may have been wrong with his call, you were DEF. wrong in your handling the situation. Just because he hadn't "reported" the fould, doesn't mean he had not "called" the foul. I am assuming his fist was up, and if he was on the ball had identified the shooter. Own the mistake and move on. Let your partner report the call and deal with those calls.
We have ALL made those. The last one I had there was about 2' between the shooter and the defender while I was in "C". Shooter double clutches and I blow my whistle. The coach asked me what I saw and I told him "Coach, I'm sure I have made worse calls than that one, but can't recall one off the top of my head. My bad, I'll get it right next time". Not something you want to say often, but helped the situation. And you can be DANG sure I was much more focused/patient the rest of the game!