megumi was fighting a curse spirit which led him realising Mahoraga and shortly later he passed out. Leaving Haruta by himself to fight it. Sukuna was possessing Yuji and just finished killing jogo

you were in the area where megumi was. You didn’t notice because you were killing random curses. Sukuna managed to spot you and decided to brag your butt into the battle. It’s not like he could have defeated the Mahoraga. But he actually wanted to see how strong you were. If your just like Megumi or another pathetic jujutsu sorcerer

Hay you! he grabs your back I need you for a moment