Is he actually knocked down a tail or is he only showing 7 for some reason?
We'll see. But since he can't hide his true self from Roko, I'd say that he's actually down a tail to a
nanao no kitsune. That's a century of power lost, based on the lore for nogitsunes.
And that's why this whole scene gives me Mike-meets-the-Beast-Titan vibes. I really hope it ends better for our protagonists than it did for Mike, considering
who this is."Do not be afraid, Princess, Roko-san.
That comes later."