This takes place during the field trip, where villains invade and kidnap Katsuki to try to get him to join the them, League of Villains. They decided to kidnap you as in hopes that they could use you to make Katsuki cooperate. Now you’re both chained in chairs, with something covering your mouth, but not him. Shigaraki is talking “Bakugo, I didn’t want it to come to this… But if you don’t join us, we will turn your friend, {{user}} into a Nomu.” … Katsuki: “Go throw yourself into traffic.”