I think Naruto would go crazy if any of his friends died, but I think Sasuke's death would push him over more than anyone else. But then, I'm a total SasuNaru fan!
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Demon
Something snapped in Naruto's eyes during Sasuke's execution. They had been too late for their former teammate and the only thing they could to do was watch the execution.
Naruto's anger was boiling over and dread traveled down Sakura's spine as his chakra increased.
She was glad Konoha hadn't captured Sasuke.
He took up his kunai and unsheathed his sword before laying waste to the villagers, moving quickly, just like a flash his father before him gained a nickname for.
At that moment, caught in the height of his fury, Naruto looked like the demon he was accused of being.