Lee Sin looks around and notices a short lad with very odd black hair. I shouldn't be deceived by his silly appearance. The man dashes forth, Lee Sin quickly shifts his stance into more of a fighting based stance. With his right side back at a forty five degree angle. His fists come up into a boxing styled stance keeping his hands completely open palmed. The short guy stabs at Lee Sin's front and immediately Lee shift back and jerks his body to the his right side, only to realize it was a feint. The moment his body jerked the man flipped above him at fairly high speeds. However since gravity only works so well Lee had time to wait for the man to in mid flip to instantly activate his Byakuugan, completely unbeknownst to his opponent. However, once his opponent lands Lee pretends to be completely unaware of his opponent's actions and remains ready to react watching the man intently without turning his head too much. Once landed the man spins and moves his rapier towards him and Lee focuses chakra into his palms using Jyuuken he spins around in an instant before the rapier would make contact. He spins to his right, shifting his right foot around using his left foot to pivot. With his palm up and chakra in it he uses his right palm to deflect the rapier blow by hitting the side of it with his chakra infused palm to send it far off course.
The instant he moves his opponent's rapier is knocked off course he continues with his rotation as if he was going to use his rotation technique which gives him an extreme speed boost making him way then an average shinobi allowing him to follow through almost instantly with a palm strike. With chakra is still in his palms and his opponent off balance, from him having deflected his rapier, completely unexpectedly since he shouldn't have been able to see it coming without a the knowledge that Lee was a Hyuuga. So Lee, nearly instantly following up with his left hand he smashes his palm into the young man's face unleashing a burst of chakra from his palm not only smashing the man's face in but also damaging his brain. If the hit were to land the man should become unconscious the moment it hits.
It's foolish to try to face me in close quarters.