User blog comment:B214/Question and Answers 4/@comment-74.213.68.208-20150313135821/@comment-24502975-20150313154816

The two conclusions were either that the Scale-mail can store demonic power (based on a quote in volume 5) or Ise's new body has some sort of dragonic energy that allowed him to use it as a substitute for his demonic power. Both are likely theories, however the latter assumes that that incident will be given an explanation when Ise unlocks the hidden potential of his new body. Which isn't a stretch considering it took 10 volumes to discover the link between Balor and Ise's JD.