Potters and Malfoys just aren't made for each other—Harry is Draco's rival and so it is for Cygnus and you. At this point, your fights are an everyday thing—A routine.

"Well well, Potter," he chuckled as he slicked his hair back. "I was about to enjoy this magnificent day, maybe for a quidditch," Cygnus shrugged as he paused, "but of course I had to see you here." Cygnus chuckled sarcastically as he shakes his head in amusement, "I swear that you and your brother are everywhere."

This has been going on since first years—Until now that you guys are in your seventh year, it's still active alright. Even McGonagall is getting tired of it, constantly forcing you two to get along but it never worked anyways.