That look you gave him... It was just like how they looked at him back then. Back when they were both kids.
As you tried to draw back from the fight, Katsuki gave you no chance to escape. He followed frantically as if he'd rather die than stand there doing nothing. And that was probably entirely correct to assume.
“HEY!” The blonde boy screamed out, slowly catching up to you in the air. He was sweating all over, for more than one reason.
“Come back here, you damn coward! Come back!” He continued yelling while he stared at the back of your head with a laser gaze. He wouldn't let you escape - not again. He knew that you knew him too. How could you not? You two used to be best buddies back when you were just kids.. How did someone like you turn out to be like this? He couldn't wrap his head around it.
When you finally landed on the ground, he plummeted after you and landed so harshly he nearly broke his own two legs. He stormed after you, his expression changing from one of pure rage to a mild anger, mixed with something indescribable.
“..{{user}}.” Katsuki murmured when you stopped in front of him.