HOW HE FIGHTS (new)

Well when ever we see feitan fight we just seem him quickly cut their head off or hit them in a few spots and they go down but what's hi ability? Well he uses an... UNBRELA!? Yeah he hides a sword/kniff in it ( so KGB STYLE ^o^) and he well fights with even if feitan is a Henka it seems he likes to use Gugenka I mean they ARE bedie each other on the nen thing ( I don't blame him for using Gugenka I would)