Kaguya's head should have been sent flying...

[V h o]

Thanks for the advice, here it is :

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No problem. I kind of ignored the fingers lel. But then what is the black things then? His chakra arms are black then? I'm even more confused now XD

 

[Alastor]

No problem. I kind of ignored the fingers lel. But then what is the black things then? His chakra arms are black then? I'm even more confused now XD

I'm guessing they are part of the Bijuu mode tattoos (or whatever you want to call them) Naruto wasn't using the back things to attack, you can see the borders of the arm :

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