The issue one had to deal with when fighting Jace was that, due to his ability, he was almost impossible to surprise. The realization that Rose was about to try to disarm him hit while she was still in the middle of teasing him with that cute irritating smirk, which was likely the reason why her teasing didn't bug him all that much. As a result, he had tightly wound his hand around the hilt of his rapier a few seconds before the girl tried to smack it away. Having kept himself from getting disarmed, Jace then reflexively rolled away the moment she landed behind him, his feet leaving the ground shortly before her newly extended weapon reached where they'd been. The roll ended in a crouch, from which the tactician proceeded to take a couple bounds away from Rose, he needed a bit of space for a moment.
She...Wants me to try to kill her? Jace had never been in a duel in which he was expected to go for the kill, most people valued their lives more than a bit of extra excitement. Of course he'd done a lot of practice with a sparring rapier, a weapon specifically designed for sport and therefore incapable of taking another's life, so he was very familiar with not holding back. But this girl wanted him to try, without even the limitations he put on himself for a non-lethal encounter, despite the fact that he wielded a weapon specially designed to kill.
The young man took a deep breath, breathing in through his nose and out through his mouth, taking a bit of enjoyment from the fresh Serendipity air. "So you want me to try..." He muttered under his breath as he looked down the blade of his sword at the girl, now well out of range. Even as he pointed his sword at her, he seemed a bit reluctant to go all out. But gradually, as he stood there thinking, the desire to try became more and more prominent in his mind. It wasn't long before his competitive desire overcame his concern for his opponent. "Fine then." Jace's voice was suddenly a lot more decisive than it had been before, his bright blue eyes shining with an icy determination. "I certainly hope you're good enough to deal with this..." He once again brought his weapon up to his face in a fencer's salute, once more twirling it in the air bef-
The tactician's long legs carried him across the space between them in a streak of black and silver, immediately closing the gap and bringing him into range. "En garde!" He shouted with a competitive grin on his face as his sword whistled through the air. Rather than make any single, dedicated strikes, Jace effectively began a flurry of precise thrusts. Each successive attack tried to build off the one before it, with Jace using his ability to try to predict how Rose would react. From there he would try to counter her response before she could even get it moving, striking at any openings her reaction might reveal. The girl wanted him to try to hit her, and as a result the limit of 'win without cutting' had changed to 'win without killing.' Every attack, if not responded to, would leave a cut this time.