Re: Rashensuriken
Each time Naruto charges natural energy up he has enough for two rasenshurigan. So Naruto used up two "batteries" he has only one left. I don't think Naruto is hurt because natural energy is different and at sage mode Naruto is stronger which mean he is stronger at forming and confining chakra. We saw the natural rasenshurigan was really confined/compressed to the size of a plate and it expanded when released. The fact that Naruto is able to compressed the chakra so much it would imply that the spinning chakra can't rebound back into his hand preventing injuries.im not sure actually...what did he say "even in sage mode i can only do 2 rasen shurikens. so that means i've only got 4 left"
when he said that - he was out of sage mode/natural energy, but I think he is saying in general terms -that is, in terms of his physical body
I'm pretty sure he is taking damage from them in both sage/normal mode...there is still probably cellular damage but it is either reduced or unnoticeable in sage mode (until after the fight)
but we will see because he is using a lot of them - which sucks and is repetitive but there are new moves once it is 1v1