Karkat took notice of the shift. He wasn't one for dueling in places like the library either but he had his fists instead of his wand - his wand was back over there with his ruined schoolwork. His scowl deepened and he stepped back, hands clenching at his side before all of a sudden his fist connected with Equius's face, all of the frustration and uncertainty and confusion of the past month or so behind it.