By Any Means Necessary
First and foremost, I want to make this clear. I don't own any of the characters, techniques, etc… found in this fan fiction, nor do I claim to. I also took a lot of creative license, creating, and possibly changing jutsu. I merely wrote this because I have too much free time. Enjoy
Prologue
The two ninja, once best friends, now archrivals, it seemed, were locked in combat. It had come to blows between the two, genin by title, but so much more by stature. One, the prison in which the dreaded nine-tailed fox was held, and the other, one of the only surviving Uchihas, and bearer of one of Orochimaru's curse marks, the pair launched blow after blow towards each other. Their forms distorted beyond recognition, they battled on. Sasuke's hair had gone white; his eyes sinister, and monstrous wings had sprouted from his back. Naruto's appearance was feral, sheathed in glowing red chakra, and his teeth and claws extended to resemble the fox inside him. They stopped a moment, glaring across the waterfall; each perched on opposite sides of the monument.
"Naruto…" Sasuke said in his naturally cocky tone.
"Sasuke!" Naruto growled through bared fangs.
"The time for words has passed…It's time to end it. Here and now, one of us will exist only in memory." Sasuke said as he lowered his right arm, grasping his forearm tightly with his left hand. "Chidori…" his breathing became labored, as he forced all of his remaining energy into the ball of lightning attached to his arm. One thousand birds, it was sometimes called, as the sound it made resembled the chirping of so many birds. Naruto just glared in response, forming a spherical manifestation of chakra in his right palm. A shadow clone was summoned to his side without hand signs, gestures or words. The clone reacted quickly, forcing the vibrant energy to spin rapidly in Naruto's hand. Simultaneously they leapt from their positions, the ground at their feet erupting and falling with the waterfall to crash into the lake below.
As the two flew at each other, time seemed to slow for this climactic end to their battle. Sasuke wore an arrogant grin, and Naruto's face was full of anger. The silhouette of the nine-tailed beast rose behind Naruto, feeding from his anger and drinking in his power. Sasuke continued to smile, unconcerned with the outcome of the battle. Their hands out stretched, only feet away, the very air around them began to crackle with power, and the water parted around them as if to avoid being destroyed. Inches away, a dark burst of power enveloped the two, hiding the fight from any onlooker. The two combatants, however, needed no sight at this point, and collided. Sasuke's Chidori and Naruto's Rasengan plowed into each other, merely extensions of the two ninja's limbs.
"SASUKE!!" Naruto shouted once again, though his voice was lost in the cacophonous roar of the waterfall and the two forces colliding.
"Naruto…" Sasuke sighed once more as his eyes closed. The two Jutsu exploded, catapulting the two forms in either direction. All semblance of energy was gone from the valley, and it was quiet, until the waterfall's rushing water resumed its eternal journey.