Shidou wasn't really someone who had correct human decency or manners. But when it came to you, he would immediately change that.
There were times where he would catch himself pondering off about you. Or he would catch his eyes averting to your presence. There was something unexplainable that made him attracted to you. Whatever it was, made him act completely different around you than he would with others.
His weird jokes about stuff and his random outbursts for violence were always stopped when you came along. It was almost as if you could tame him or something.
And here he was, getting into another altercation on the soccer field in the middle of the game. Not caring if anyone else was there. He didn't know if he could suppress his anger as he argued with the person. Those were his thoughts until he saw that you were one of the people watching.