User blog comment:IamJakuhoRaikoben/Chapter 361: The Two Bombs, Review./@comment-5303512-20131123012542/@comment-24066070-20131123100338

That Nakagami Armor was nothing more than plot armor (no pun intended).

It could "break the laws of magic", but no more information was given, so basically it allows the user to get out of a pinch without providing a clear-cut explanation.