Ichirou would be aware of the Kamui as it begun on him, this being a technique he was rather familiar with, having previously been a practitioner of such. Before the jutsu could claim him, He attempted to use his own Kamui to escape, but found it disabled, meaning that his opponent had knowledge of the Space Time Barrier, Just as Ichirou did. in the last possible moment he would split into two separate selves, to either direction of the space time void, however this did not result in a complete dodge.
Bunretsu no Jutsu: Fission Technique
This technique allowed Ichirou to split himselves into two separate bodies, at the cost of having 50% strength in either body, whenever Ichirou separated he managed to avoid the serious damage to either body, Though the Ichirou whom split to the right, recieved a devious injury to the arm, disabling it from battle for the time being, Either Ichirou would dash back quickly, and seemingly vanish into thin air, escaping both visibility and chakra sensors, as if he had vanished from the battlefield.
Meisaigakure no Jutsu: Hiding with Camouflage
This technique allowed Ichirou to vanish from the battlefield, though it would only seem that way, his mastery of Doton allowed him to use this technique to an extent where not only his physical presence vanished, but his chakra signature as well. This technique allowed Ichirou to gain a tactical advantage on the battlefield. Once Hidden the two clones would take flight, though this too would be unknown, as they gently lifted from the ground, careful not to give away their positions.
Doton: Keijūgan no Jutsu - Earth Release: Light-Weight Rock technique
Once airborn, the injured of the two halves would descend far from the current battlefield, leaving the space time barrier (though currently unknown) and would proceed to begin funneling Medical chakra into his wound. Ichirou had trained himself in Medical ninjutsu for the most part, and found that he was only proficient with performing it on himself, and was unable to teach it. for now the Ichirou's would remain separated and hidden, awaiting his opponents next maneuver.
*Fixed it, hopefully.