But you see what proves my point is
the motion of the arm he is using to push off Ama. It is not a completely mental ability like chakra arms to use the physical claw of the Kyuubi.
We only saw the front of the paw in this picture. Look at the swiping motion Naruto is doing and look at the claw. The claws hand is facing frontward
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I think it's just too much of a coincidence the technique resembles a claw and then he activates BSM afterwards. Kishi should have at least given the technique a name if it was completely new.