Board Thread:Theories and Speculation/@comment-31099706-20170306084343/@comment-734582-20170306180018

Namikazenaruto9 wrote: I thought Torii had something to do with Uzumaki KKG/Funinjutsu. Honestly I was thinking of some wood jutsu which would grow with senjutsu chakra.(like how tayuya's demon absorbed the body part akin similar to that) I meant the wooden arch things Hashirama drops out of the air.

it could also just be similar to the Five Elements seal, reacting to the Senjutsu and essentially sealing away the Nature energy.