Sonic didn't trust Knuckles and thought he might be doing something that wouldn't be good for the Freedom Fighters. He punched Knuckles and that started the fight. As it went on, it became a fight to basically prove which one is the best to the other. --True Red
In the comic "Clash of The Titans" when super Sonic and Hyper Knuckles battle, I wanna know why were they battling and why did they trasform.