tref wroteIn the IAABO manual it says the L officials may apply the A, B, C technique. We all know the difference between "may" & "shall" in the book.
That's correct. It's an option, that should probably be pregamed. And it's a true rotation with the trail moving across the basketline when the lead comes ballside.
At least that's what it says in the manual. In reality, around these parts, nobody uses this option. Never. When the lead comes ball side to help out with post players, it's just for that one play, and it's his responsibility to eventually hustle back to the weak side.