Batto-jutsu

Batto-jutsu (抜刀術 Battō-jutsu), also known as Iaijutsu or nukijutsu, is a technique used to increase the speed of a katana draw by two or three times. You press the blade's edge against the inside of the sheath, then draw by pressing the sword out and pulling at the same time. In this way, the attacker can attack before his/her opponent can react.