Pain and Gedō Mazō questions

[BlueToweR12]

Is this a transportation technique? (Naruto Anime 166)

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For what is this scroll ? (Gedō Mazō mouth)

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[Six Paths]

I don't think it is a scroll, I think it is a mouth cage.

 

[VongolaX]

Gedo is bound by chains and a mouth piece, but when summoned for combat/extraction it breaks off.

 

[BlueToweR12]

And what is with pain eyes?