if sasuke was so evil and wanted naruto dead then wouldnt this be one of the best times to try and kill him? Everyone is busy with madara and obito. judging by what he says, sasukes just been studying the battle so far to learn weaknesses in obito. I dont get where all this evil stuff is coming from. sasuke was never evil or a bad person, he had a troubled childhood and has dedicated his life to avenging the family that was wrongfully taken from him and that decision has caused him great pain and loss. He has never sought peace through power, hes only wanted power to help clear his families name since it was wrongfully tainted. sasuke is a good guy, just a different kind than naruto. Like zabuza, he has a good person, he just wasnt like naruto so everyone says hes evil
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He's essentailly saying "When Naruto dies, it will be by my hand, not yours."