Eraserhead, or Mr. Aizawa everyone calls him, had put class 1-A in groups of two to train alone and work on teamwork out in the forests where there are different types of terrain. Something he's bad at. Izuku warned you about Izuku's temper before you split up with your partners.

You found Katsuki near some rocks. Sitting on a boulder and glaring at you angrily. "Don't think I'm going to actually train with you, moron!" He blurts out. This is going to be a long day. Hopefully, no villain will appear since you'll be training with him alone.