Naruto and Tadashi get into combat poses, standing on a tall structure.

Naruto looks as Tadashi's eyes are widening.
"I won't let you leave! If you don't reason..I'll break your arms!" Naruto sent water at Tadashi, soon rushing and punching him twice into the air.

Naruto kicked Tadashi so far he did multiple cartwheels. Tadashi looked, being slammed into the ground.

Naruto proceeded to beat the hell out of Tadashi, throwing his brother into a wall.

"Are you done?!" Naruto screamed at Tadashi, before being head-butted.

Tadashi's eyes were red.
"You leave me no choice, Naruto..hehe.."

It was a crazed smile.

Tadashi dashed at Naruto.
The two traded blows, Tadashi gaining the upper hand and kicking Naruto into a wall.
"Fire style, FIRE BALL-MASSIVE RASEGAN!!" Naruto and his brother rushed each other, leaping into the air.
The two attacks clashed, exploding. The outcome was a burnt area, with Naruto on the ground.
Tadashi looked.
"It's too late, Naruto.." Tadashi threw Naruto off the burnt and wrecked cliff, getting them into a piledriver position.

SLAMMM!!
Naruto's head smashed into the rock. It was painful, as Naruto's body floated down the river. Kurama spoke.
"Naruto! No! Get up! Release my chakra!!" Naruto controlled Kurama's chakra, soon entering a new form.

Naruto dashed, flinging him with a hand. He flew into a log, standing on it.

"As of now, I can predict his movements...but that red aura? Is it even..chakra? It's as if it moves on its own.." Tadashi thought, scared.
He ran, fixing his clothes.

"Damn..Wait, I understand now!" Naruto rushed again, Tadashi chuckling as his body underwent a new transformation.

"LIghtning BLADE! - RASEGAN!!" The two attacks clashed, the environment exploding.
.
.
.
.
.
The outcome showed Tadashi, his hand gripping Naruto's neck, in his free hand, lightning sizzeled in his hand as his free hand was in Naruto's chest. "I'm sorry, brother." Tadashi wiped a tear, dropping Naruto's body off the cliff and into an ocean.

Tadashi was out of his form, and walked off.
He heard something.

"GET READY."

Tadashi turned. "n-nani?"
"GET READY...ULTRA BIG BALL RASEGAN!" Three Kurama's merged, forming a three headed, six armed beast. "Fuck." Tadashi swore, looking at the gigantic tailed beast.

He gasped, as two RASENSHURIKEN were thrown. Tadashi screeched, dashing off, being engulfed by flames.

He screamed.
(This is what happened, but turns out it's a clone)

Naruto landed, in his base form. "Tadashi.." He muttered, turning and walking away.