[ It briefly occurs to him that he certainly could "cheat" quite easily, since it's hardly as if he has to keep his being all that secret, but Chiron is pleasant, interesting company. It's not much, but keeping Sebastian's interest is a way to earn a bit of his respect, and so even though he could tap into a bit more of his natural abilities, he decides against it. Playing fair is how he'll show his respect, though quietly. That, and it would also be a bit boring, if he's honest.
So when the sword comes, Sebastian's movement in turn is fluid and natural, but not impossible. His blade turns down to catch Chiron's outstretch blade and stop it from hitting its target as he turns his wrist to catch the blade and push it up. It's not overly strong, but it still may catch Chiron off balance and unable to recover. But the effect is at least two-fold, since Sebastian has to reposition his sword as well. He turns the blade in his hand slightly, turning the upward motion into an upward slash as he steps forward. At the very least, it's likely to push Chiron back a step. ]
me every time i write a sword fight: i have no idea what i'm doing
So when the sword comes, Sebastian's movement in turn is fluid and natural, but not impossible. His blade turns down to catch Chiron's outstretch blade and stop it from hitting its target as he turns his wrist to catch the blade and push it up. It's not overly strong, but it still may catch Chiron off balance and unable to recover. But the effect is at least two-fold, since Sebastian has to reposition his sword as well. He turns the blade in his hand slightly, turning the upward motion into an upward slash as he steps forward. At the very least, it's likely to push Chiron back a step. ]