He's used it before, when Chakra-Absorbing Pein absorbed the first Rasenshuriken (which was a henge of Naruto). Yahiko Pein was behind "Fat" Pein, "Fat" Pein was tackled by Naruto and the Shadow-Rasenshuriken was heading for Yahiko Pein, but then he repelled it using Shinra Tensei at the last second.i said that wouldnt it be possible for naruto to use shadow frs and all u people said i was nuts well i was right
how many people told you you were wrong? it's been done before, so why not again?i said that wouldnt it be possible for naruto to use shadow frs and all u people said i was nuts well i was right