His byakugan can see the chakra network, chakra flow, and chakra color. Im pretty sure that he could see it coming and then react accordingly.
I was completely right on that facial transformation. This:
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is very different from this
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which is more along the lines of how Naruto reacted to Haku
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Haku was barely able to react to an immense speed and was grabbed and punched
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He baically called upon the chakra
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. Neji confessed the great increase in his speed
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. He barely reacted to it
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Check out the difference in the healing speed which is incredibily fast - his wounds healed right in the blink of an eye - his reflex and reaction speed, together with his over all body speed. I am sorry but there is a huge difference. Sasuke was unable to react to it in 2T
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. As soon as his three T awoke
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he was able to see Naruto in this form in slow motion
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Secondly, Sasuke was STILL able to react to Naruto himself even in his cloaked form, the only think he counldn't react to was the chakra that was moving on its own -
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. He reacted and pulled away and used a Katon attack to hinder his movements -
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There is no way Neji is hitting him, when he barely reacted to Naruto's small speed boost compared to this form. I will post the remaining argument at night.