Sukuna explains that a pact made with jujutsu cannot be broken or else Sukuna will be punished. It is because Yuji tried to use Sukuna's power without a Binding Vow while the curse was unwilling. Yuji stubbornly refuses Sukuna and punches him, demanding he be brought back to life without conditions. They both agree to fight to the death in order to determine who gets their way, and Sukuna instantly bisects Yuji's head.
Sukuna explains that a pact made with jujutsu cannot be broken or else Sukuna will be punished. It is because Yuji tried to use Sukuna's power without a Binding Vow while the curse was unwilling. Yuji stubbornly refuses Sukuna and punches him, demanding he be brought back to life without conditions. They both agree to fight to the death in order to determine who gets their way, and Sukuna instantly bisects Yuji's head.