That was all Yoh needed.

"Good," he said. He stood then, and crossed to his sister. With unbelievable tenderness and gentleness from someone obviously capable of so much damage Yoh scooped up his little sister's limp form. He muttered an apology to her carried her from the room, supporting her like a parent. He didn't look back at Snape again, but left him there bruised and bleeding.