Question

[NewNCref]

I, too, am unfamiliar with this 80/20 concept. And it seems to me as if the only foul on this play was a jumping into the player, which I usually signal as a push, as B5 was dislodging A1 from his already established position. Then again, depending on how quickly A1 is moving toward the basket, and the angle and speed at which B5 comes in, I could also see going with a block here.

I guess my point is, I would take a common sense look at the play, and say to myself, "did the foul cause the offensive player to change direction?" If yes, then I've got a push, if no, then I've got a block.