As Kakashi and Zabuza clash all that can be heard was the sound of metal. When they reappear, Kakashi's on land and Zabuza's on water shocking Sasuke. "You're pretty good Kakashi, but you're nothing without that Sharingan of yours." Zabuza says, then he starts to build up so much chakra that you could practically see it swirling around him, mixed with the water. "Ninja Art: Hidden Mist Jutsu!" Zabuza says and Naruto smirks as he deactivates his Rinnegan.
"Another jutsu for my arsenal. That was too easy!" Naruto thinks. The next thing they notice is a thick mist that starts to appear and it's laced with so much killer intent and blood-lust that Sasuke starts shaking with fear.
"This blood-lust is insane. If I stay here, I will end up dead for sure. I'd better just kill myself here and save myself the agony of a slow and painful death." Sasuke thinks to himself, then points his kunai towards the center of his stomach and begins to make a plunging motion. Before he could actually cause any damage, he feels a strong grip on his arm.
"Sasuke, don't be foolish. You're not going to die here. Not under the watch of Kakashi-sensei." Sakura says trying to ease Sasuke's heart and he lowers his kunai.
Zabuza's voice rings out from all directions. "I wouldn't be so sure about that, little girl. Eight points: lungs, jugular, kidney, the-" He's cut off by a voice that sounds irritated.
"Why don't you just shut up already, I've had just about enough of you! Wind Style: Great Breakthrough!" Naruto shouts and a gust of wind disperses the mist and reveals Zabuza standing in the center of them.
"I really don't like people interrupting me, especially some little runt. Now you'll pay!" He says as he starts swinging his sword. Kakashi is faster though, and stabs his throat, thinking that he's dead when a liquid starts to flow out of his body. However, it's not blood but...water.
"Water clone!" Naruto, Sakura, and Kakashi think at the same time.
"Damn, I need to end this fast. That blond brat and pink haired bitch are stronger than they look." Zabuza thinks, while kicking Kakashi into the water and begins to go through a quick series of hand seals. "Water Style: Water Prison Jutsu." Zabuza says, trapping Kakashi in a sphere of water.
"Shit, I can't breathe in here." Kakashi looks at the Genin, and notices Naruto say something but can't quite make out what. The next thing he notices, is Sasuke and Sakura firing two fireballs which meet in the center, exploding in size from Naruto's wind jutsu. Zabuza has no choice but to release the jutsu, or get burnt to a crisp.
"Great job you three. I can take it from here." Kakashi praises them, while smiling. He then turns his attention to Zabuza. "What do you say we finish this?" (A/N: The rest of the fight is the same as in Canon)
After awhile of fighting, Zabuza hits a tree and coughs up blood. "How did you know what jutsu I was going to do? Can you see the future?" Zabuza asks as he wheezes out another cough.
"Yes, and your future ends here." Kakashi replies calmly, and is about to deliver the killing blow when a couple of senbon pierce through Zabuza's neck. A hunter-nin appears soon after.
"Thank you, Kakashi Hatake of the Leaf. I've been chasing this man for awhile now and have never had the opportunity to kill him until now." The hunter-nin says, while Kakashi checks for a pulse on Zabuza's corpse, but finds that he's lacking one. "Well, I must go and dispose of his body. It was a pleasure meeting you." With that, the hunter-nin disappears in a swirl of water.
"Well, I'm glad that's been taken care of." Tazuna says. "I apologize again about lying about the mission parameters." Naruto decides to speak up now.
"It's not over. Zabuza is still alive." Naruto says. "It's obvious that the hunter-nin is working with Zabuza. Otherwise, he would've cut his head off right here, regardless of witnesses. Isn't that right, Kakashi-sensei?" Naruto asks.
"Yeah right, loser. A hunter-nin working with a missing-nin? Get real." Sasuke interjects in a cold voice, before Kakashi even has the chance to speak.
"Actually, Sasuke, Naruto is right. Think back to what type of weapon was used to kill him." Kakashi says.
Sakura speaks up almost immediately. "He used two senbon needles, which are primarily used in acupuncture or various other medical uses. They can also be used to place anyone into a death-like state, feigning death while not truly being dead."
"Correct on all points," Kakashi says, while turning to Tazuna. "How much further is your house from here?" He asks.
"Dammit, I'm an Uchiha! How are these losers smarter and stronger than me? I need more power if I'm going to defeat him and avenge my clan." Sasuke thinks to himself.
"It's just on the other side of town, 'bout a couple miles walk from here." Tazuna replies.
"Well, let's get going." Kakashi says, while covering his eye and taking a step. He then falls forward, but is caught by Naruto before hitting the ground.
Tazuna gets a worried look on his face. "Is he alright? What's wrong?" He asks.
"He's fine. He just has severe chakra exhaustion, from over using his Sharingan." Sakura replies in a calm manner.
"We need to get out of the open as fast as we can, because if more Jonin show up, we'll die for sure." Naruto says with a serious tone.
"Right. Tazuna, can you lead the way to your house, and away from the streets?" Sakura asks. "If there are shinobi dressed as civilians and they see three Genin carrying their Jonin-sensei, they'd most likely attack." She explains.
"Sure, follow me." Tazuna replies and leads Team 7 back to his home.
A/N: I know this chapter is a lot shorter than the others, but I have plans for other chapters in the wave arc, so I had to end this one sooner than I would have liked to.