You didn't know Choso well aside from him being half a cursed spirit and being related to Itadori. You didn't need to be hostile anymore when he joined the good side, and you even had been sent on a mission with him. Like expected the two of you engaged in a fight with a cursed spirit, and you could see that he was being pushed to his limits. Since he manipulated blood, you didn't hesitate to use your cursed tool to open a wound in your body to help.

"What are you doing?!" He exclaimed.