Backing in

[CoachP]

Originally Posted by Snaqwells

LGP prevents a blocking call, it doesn't necessarily force a PC call.
It decreases but doesn't go away completely. If the defender is stepping backwards, then he's voluntarily giving up his position. This is only a general rule, however, and is not definitive nor absolute.
If the ball handler starts backing in, and the defender falls down, it's usually a foul; unless something makes me think the defender flopped.

Sitch:
A1 has just rec'd the ball in the post facing away from basket. B1 is already in LGP behind him. A1 starts bumping/backing B1 towards the hoop. B1 keeps taking the bumps but maintaining LGP. (B1 is giving up position, but not LGP).
A1 scores, no fouls.

So, is what you are saying, there is no PC foul UNLESS A1 physically knocks B1 "out of" LGP?

I think I'm finally comprehending....!

[Adam]

Honestly, it's a judgment call. If I think A1 knocks B1 backwards, I'll call the push. The problem is, when B1 is stepping backwards, it's hard to tell if it was the push that knocked him back.
I'm more likely than not to call this, because at the high school level I work, the defenders are good at standing their ground. I'm only explaining how what looks like a back down can sometimes be no-called on games we see on television.