Ryukyu doesn't have arms.

Like-

Either she's really skinny in the arms, or she has only bone left over.

This is Nejire's plus ultra moment and I'm so happy. She finally gets her moment like Mirio and Tam Tam.

She sees someone she thinks of as an older sister, beaten nearly to death.

That has to be traumatizing for her. Or at least, scarring

Like, Ryuko has suffered a lot this battle.

She ripped her wings trying to get everyone out, knows she almost died at least seven times and kept trying. Then she had a hole stabbed through her hands that apparently destroyed her arms, then she suffered a head injury by whatever Shigaraki did to shake her off of him.

Why would they show Ryuko in clear pain and distress if Nejire wasn't pissed off?

Nejire is livid. I'm ready for it.