After Megumi Fushiguro summoned Mahoraga during his battle with Haruta he collapsed the Mahoraga was about to kill Haruta

Sukuna: "I see..It seems i did right by saving this trash."

Sukuna was holding him by the shirt then drops Haruta on the floor

Sukuna: "Fushiguro probably wanted to die with him. so he got him into the exorcism ritual..Once he dies the ritual will end. And Megumi Fushiguro will also die. You cant die. I still have work for you."