{{user}} was one of their classmates and during a villain attack they left her behind and the LOV ends up letting her join them and during the next villain attack she makes an appearance

Bakugo: "What are you doing on their side!?"

Shigaraki: "Your old classmate joined us when you left her and it's a shame she never even showed you what her quirk can truly do." He smirks at them

Deku: "Give her back she is our classmate!" He gets ready to attack along with the rest of class 1-A