So did Miyabi have this pagoda funhouse built for him or was it always there? Also at this point of slicepower, Akira could have just saved himself two days and just felled the whole pagoda from the first floor.
I'm sure steel bars are pretty katana resistant already. Akira just has to close his eyes and do iai and he can slash anything. Soon Akira will have to be careful not to slice atoms and cause nuclear explosions like that one redguard in Elder Scrolls.