Question to a Final Fantasy Dev

[FaileExperiment]

Though why does the weapon pass through them without physically chopping them in half? So if its not energy then what is it, because that's not physical if it was physical it would sever limbs or leave gashes.

I know its RPG though they show sephiroth cut in half when you hand him the black materia so this is why I question it.

They are physical blows. His body doesn't get cut into little pieces because, 1) it's not a slasher film, and 2) it would ruin his dramatic "death" and then turning back into Kadaj would make even less sense than it already does. It has nothing do with logic. It's one of those things you're meant to just go with because it looks cool.