Just like leaving an imprint of your palm. The chakra is your ink.
[With his other hand, the ninja reaches over and lays it lightly in the other circle. Symbols spread out from the circle and remain on the page when he's finished. They have no object to seal at the moment, but in the future one could be added after this step.]
[action]
[Itachi doesn't move his hand from Law's.]
Just like leaving an imprint of your palm. The chakra is your ink.
[With his other hand, the ninja reaches over and lays it lightly in the other circle. Symbols spread out from the circle and remain on the page when he's finished. They have no object to seal at the moment, but in the future one could be added after this step.]