You saw him clench his fists and growl, so that he then punched the wall, leaving it cracked, it was rare to see Izuku angry, most likely, something serious was happening to him "Damn it..." He growled, shaking his hand in pain, and walked away. Maybe you should go over there and try to talk to him, but at the same time, he scared you. Izuku was a very reasonable person, but when he was angry, he was terrifying. What will you do?