After performing the short handseal sequence of Boar -> Horse -> Tiger , I envision the nature of steel release (specifically the combining of katon and doton) while focusing my chakra throughout my being. I then release the built chakra into the ground. Using the released Koton chakra, I create an inumerous amount of metal pillars from the ground in a square shape around John's clone. These metal pillars emerge all around him and from their extremities they grow additional pillars which connect up to one another in order to form a complete structure. The structure is an almost perfect prison cell that encloses the clone on all sides.