Intentional foul mechanic

[rsl]

I'm sure I screwed this up, so time to get the mechanics right ...

A1 driving to the hoop, beats his man B1 by more than a step. B1 grabs him from behind as he goes in the air for the layup with one hand on each hip.

I stop the clock with fist, then make the initial signal for intentional foul with both hands over head. My partner clears the lane and I head for the table.
At table I give the holding call and verbally call it intentional. B coach thinks
I have changed my mind about intentional call and starts yelling that my partner is vlearing the lane.

I clearly signaled intentional foul and my partner got it, but showing the hold signal at the table confused the coach. Should I have stuck with intentional foul signal at the table as well?

My perceived uncertainty (actually I was never uncertain at all, but coach thought I was) led to some extra fireworks from the coach, and I almost had to T him as well.