Kakashi: Sharingan Warrior!

Kakashi: Sharingan Warrior! is the ninth episode/chapter of The Life if a Kunoichi Shinobi.

Synopsis
Naruto's strategy and teamwork with Kristin and Sasuke is a success, and Zabuza is forced to break his hold on Kakashi to avoid their attack. Saved from Zabuza's Water Prison Technique, Kakashi attacks his enemy with multiple water techniques copied from Zabuza using his Sharigan. All the while, Kristin is watching the fight from her vantage point on the water.

Zabuza becomes agitated seeing his own techniques used against him, and Kakashi easily defeats him. Before Kakashi can deliver the finishing blow, Zabuza is killed by a young hunter-nin from Kirugakure. Naruto is angry and jealous that someone so young could easily defeat an opponent that gave Team 7 so much trouble, but Kakashi says that there are many ninja younger than Naruto yet stronger than himself. The hunter-nin leaves with Zabuza's body, and Kakashi collapses from exhaustion due to the overuse of his Sharingan.

Trivia

 * In this chapter, Kristin stands on the water's surface and watches the fight between Zabuza and Kakashi. She however, dosen't learn how to until the next chapter.
 * It will also be revealed later on that Sasuke and Kakashi aren't the only ones who can use the Sharingan.
 * Unbeknowest to her, Kristin learns her strongest water techniques from watching this fight.