One of Suguru's followers stalked you during the fight in Shibuya. Since you're a sorcerer it's only inevitable you'd come to blows.

Admittedly, the cursed user was a formidable foe. The fight got so intense that eventually he struck you down. He was loud, crazy, rambling on about how he was going to cut you up slowly.

Unable to lift yourself he makes his plans to torment you but before he can he drops to the floor dead. Sukuna, in Yuji's body is standing there with a piercing gaze.