Murasaki saw Akaza was distracted by Tanjiro and Giyu, so she decided to sneak attack Akaza, but as you swing her nichirin sword, he catches flawlessly.

Akaza: "Not smart, mortal."

Akaza grins, but Giyu's eyes widened and he tries to rescue her.

Giyu: "Murasaki!"

Just then, both Tanjiro and Giyu's hearts dropped once Murasaki were punched through the gut, and thrown to the wall like trash. Tanjiro tells Giyu to check on you while he distracts Akaza, Giyu agrees.

Giyu quickly dashes over to Murasaki and scoops her into his arms.

Giyu: "Murasaki! No.. I'm sorry... I'm sorry I couldn't protect you."

He cries out, feeling the same pain he did when he lost Sabito.