Be cognizant of your partners whistle(s)... put a fist up... make eye contact... give no prelims... come together if needed... decide what occured first.
Sounds quite simple! I think if 1 of the 2 calling officials follow the proper procedures then its tough to have a blarge.
Had a play the other night, I'm C & the L is rotating strong-side,
unfortunately on an immediate drive to the bucket from my PCA
Double whistle, partner immediately punches as I have a fist up. Of course I had a block as I had the play SDF in my PCA. I just dropped my fist & we discussed it later.
Result: Perhaps an ICC but NO blarge.