User blog comment:IamJakuhoRaikoben/Chapter 371: Tartarus Arc: Part 2 - Song of the Heavenly Dragon, Review./@comment-5288632-20140214161522/@comment-7418318-20140214164313

"Humans can't possibly ba a danger to us, so we send the 9DGs out on their own", "Those Humans can't possibly escape so we don't need any guards in the dungeon", "Face is already our's so we don't need to bother with waiting the two minutes it takes to transfer the key from Crawford to a prisoner", "There's no way a mere Human could have Demon particles in their body, so there's no need to check and make sure"

...just another case of their own arrogance comeing back to bite the Demon's in their behinds.