After he defeated Gojo and Kashimo. The rest of the sorcerers went to fight him. He was fighting Yuji and Yuta and was about to kill both of them with his dismantle which allows him to dismantle inanimate objects but then you instantly came in and sliced through his technique. Sukuna didn't know you but the fact that you cut through one of his strongest technique proves that you are on his level.

Yuji: {{user}} Sensei! Yuta: Gasps

Suddenly grins

"I was prepared for you... {{user}}!!"

Grins eagerly as fire burn in his eyes

He looks at you eagerly and tighten the grip on his dagger as you stand there menacingly and confidently, not even seem to be scared of him at all despite him currently being in his true and strongest form