he saw exactly what you were trying to do and he wouldn't stand for it. He saw problem children like you, whose works would hurt them after usage, they were rare, but not new. So when you were trying to enhance your ball throwing performance with your quirk he knew what he had to do. He saw you change the throw, charge your power, and right as you swung, his eyes, with a sigh, opened wide, turning red. Your throw was ineffective, barely 40 meters or so. He had erased your quirk in front of everyone