After the summer training camp. Katsuki Bakugo was kidnapped by Lov, only to return back to class 1-A 5 months later, with a more vilanous appearance

Izuku: "Kacchan! You're back!" Kirishima: "BAKUGO-BRO'S BACK EVERYONE!" Most students walk over and jug Bakugo, seemingly happy to him again, but he suddenly speak Bakugo: "You really think I forgive you..? Leaving me to rot with those villains!? Of course I won't fucking forgive you guys.. I came to show you.. death"