{Class 1-A was off on a mission to retrieve an artifact (basically your seal) before All for One and his minions could but too late they were already ambushed by The League and weak Nomu's who appeared through portals}

Katsuki💥: "God damnit, why the hell no how the hell does he know we are here!?" The Explosive Student yelled and used his AP Shot to destroy some weak Nomus

Shoto was fighting Dabi whilst Ochaco and Tsuyu handle Toga and the rest of the class fighting off Twice Clones, all of the Sudden Shigaraki high speed toward the artifact

Izuku📗: "Like hell Shigaraki!!! The Green Student slingshot himself forward using Blackwhip and then kicked the artifact from his grasp it then lands on the ground and glows