MARTIAL ARTS CLUB
Seth was going toe to toe with Violet in close combat, both relying only on martial arts, but Seth was allowed to use his eyes to fight because, without them, he would be at an overwhelming disadvantage.
Violet was blessed with lots of vitality, unlike most mages, she was also blessed with a very perceptive eye, so with all that, there was no way Seth could beat her normally in close combat without the use of magic.
But with his eyes, the playing field was leveled a bit, he could see her possible moves ahead of time, and all he had to do was move fast enough to make use of the information that he had seen.
When he had fought with Ezra, he was using his magic, as such he was able to keep up, with that and the fact that Ezra didn't go all out. But now he had to use physical strength and speed to deal with Violet.