Silent Killing

As the name suggests, this technique is simply a very quiet method of killing an opponent, usually from behind with a blade. Additionally, because the user is very silent, it cannot be defended against. The user will often slit their opponent's throat, preventing any cry that might give them away. Zabuza was a master of this technique, and was even good enough to track and kill opponents through sound alone.
 * Name: Muon Satsujin Jutsu, 無声殺人の術, literally "Silent Homicide Technique", English TV "Silent Killing Technique"
 * Type: Unknown
 * Users: Zabuza Momochi, Kakashi Hatake (Copied through Sharingan)