You see Piripiri become a different person, twice.

The first thing is simple: Uusha walks in. Piripiri goes quiet and focuses on her, finishing the burn she was tending and then folding her arms into her sleeves in front of her. She's not being amused at witches immediately focusing on the new magical lore in front of her anymore. She's just waiting.

There's no change in attitude when Uusha declares Giriel her proxy, but it still feels different to you, most likely, because all of that deference shifts to her when Uusha walks away. It's a little unorthodox but they're allies, maybe? This isn't the sort of thing you'd do otherwise, to anybody out of House. Maybe they're closer than she thought. She moves to stand two paces behind Giriel and one to the left, out of the way but able to help if needed.

Then the second shift. Giriel starts to talk, explaining her plan in halting detail, apologetic. Confusing, until the command. And Piripiri goes blank. Stony. You still have her attention but none of it is kind, now. Only her eyes betray her, thorny green fury. How dare you? To somebody who can't defend themselves?

She almost doesn't care that it's her, specifically. Maybe she'd be even more furious if it wasn't.

And there's one slow breath and even that fades. You're looking at the picture of calm detachment as she look down at the offered knife, then looks back up to meet your eyes. "It would be dishonorable for me to hold that." She states, and holds out her hand, palm up, for the knife's point.