[Severance]: Imagine the concept of spacetime as a piece of paper. Now imagine 相手 as an inhabitant of this paper. To 自分, beings bound to the concept of dimensions & space are nothing more than characters on a piece of paper, & using his blade, he cuts not just 相手, but the very spacetime they exist in, as 自分 remains unassailable to 相手, remaining in a higher realm that transcends spacetime.