Block or Charge or No Call (Video)

[xyrph]

Thanks for the answers guys.

It seems that everyone is in agreement that this video portrays a block by the defender.

I truly want to understand this. My understanding (admittedly incomplete) has been that to establish LGP the defender's torso must be facing the ball handler and both feet must be on the ground. for how long, I don't know, but long enough to establish the right to the floor space, an instant.

My understanding continues that after achieving LGP the defender can move backward or laterally (but not forward toward the ball handler) and still maintain LGP.

But this notion that they cannot turn is unfamiliar to me. Are we saying that after establishing LGP that a defender cannot turn to brace for impact? Let's say that the defender did not leave her spot on the floor after establishing LGP at a particular location, but simply pivoted in place to brace for impact from a "hard-charging" ball handler, and she gets displaced from the impact (pushed backward, perhaps even thrown to the ground by the impact), this is a block, because she changed her orientation in-place?

If this is the case, please give the rule reference. I want to understand this because this is contrary to what I've always understood.

As an aside, what if we take this to the extreme? A defender is stationary in the line from the ball handler to the basket, but has her back to the defender, and the ball handler decides to dribble directly through the defender (who is facing 180 degrees from the ball handler) and displaces the defender noticeably, what is the rule here?

Thank you for your guidance.