In chapter 645, we saw this panel. Since the head is not shown, we can only speculate what facial expression does sasuke display here and he's shaking too which made it more epic.
1. Extremely Jealous just like in part 1 when he discovered that Naruto's Rasengan pawns his chidori:
2. Fanboying on Naruto just like when he saw how Naruto is on par with Gaara who beaten his ass earlier:
3. Crying, his inferiority complex just reach a new height since he realized he could never catch up to Naruto anymore:
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1. Extremely Jealous just like in part 1 when he discovered that Naruto's Rasengan pawns his chidori:
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2. Fanboying on Naruto just like when he saw how Naruto is on par with Gaara who beaten his ass earlier:
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3. Crying, his inferiority complex just reach a new height since he realized he could never catch up to Naruto anymore:
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