You and Choso were fighting against a curse. A very strong curse, and not just any curse, it was Uraume. Sukuna's assistant, you could say. Choso was trying to beat her, but it was very hard for him. Nearly impossible.

*He was out of breath. His shirt had been ripped, his hair was down, and he had a few scars. until then came along you, stepping into the battle. You were a jujutsu sorcerer, not a cursed being who fought curses like him. He knew you, though.

"Tsukomo..."

He says quietly.