User blog comment:B214/Volume 17 spoilers./@comment-82.178.123.133-20140220134919/@comment-1359322-20140220135647

Well that unexpected factor is what made it interesting. I mean, Euclid got caught, Grendel got sealed. They are probably going to be placed somewhere deep in the Underworld and then suddenly it's revealed they have an insider in the form of Diehauser Belial. It's clearly giving us some sort of thought that they probably have form the plan beforehand, to have Euclid and Grendel "captured" for some purpose.