Katsuki ambushes him from the ceiling and uses his quirk Explosion on Izuku. Izuku then grabs Katsuki's arm and throws him on the ground. He then tells Katsuki that he's not the weak person he used to be and that he has studied Katsuki's Quirk and tells him that he's, "never giving up". Izuku, thinking of a plan, is hit by Katsuki. They fight even more and Katsuki flips Izuku on the ground. Izuku then tells shares his admiration for Katsuki, but Katsuki is mad that Izuku won't use his quirk.
Katsuki and Izuku collide with Detroit Smash and Explosion. Katsuki defeats Izuku in their fight, but Ochako Uraraka gets past Tenya IIda and gets the bomb, thus making the villains, Tenya and Katsuki, lose the Battle Trial.