Sometimes I'm just wondering if people actually look at the illustrations before they comment... such as this time. She's not blocking the shoulder to prevent Nagatoro from rotating in at all. She's pressing against her shoulderblades from the back when the position has already been established, which does absolutely feckall in that position because it does nothing to negate the fulcrum that she's going to be rotated around. Guess why your little video does not mention that as a defense technique - because it does nothing!
Not to mention that you first claimed that she was "hunkering down and getting heavy", which of course she also does not do, and now suddenly claim that she was "framing off" instead. You can't even decide which wrong perception you want to go with!
Go back, look at pg 15 where the throw is initiated. Nagatoro can get into position without any issue. Neither is her shoulder being blocked to prevent her from spinning in, nor is Orihara dropping low. Her other hand isn't even touching Nagatoro at all at first! The bottom panel should be a millisecond away from Orihara being thrown, but for drama reasons, that does not happen and instead Nagatoro is magically stuck in the position and needs senpai magic to pull through, because it's manga and physics don't matter.