The black Sword Embryo's technique wasn't an ancient Flying Sword technique, but an extremely profound and mysterious killing method—an assassination technique focused around decapitation.
This was how the unnamed technique was supposed to work from the very beginning, but Fang Xing hadn't fully comprehended it when he first received it from the black Sword Embryo, and he'd had to rely primarily on his own courage and adaptability to assassinate the Huangfu clan's young master instead. Only now was he finally demonstrating the full power of this unnamed technique—a technique of murder, a technique that could even transform a genuine duel into an assassination attempt.