User blog comment:B214/Question and Answers/@comment-50.11.177.49-20130617091227/@comment-108.17.150.138-20130620003827

Well, this is just speculation on my part, but I think the Bael clan might be up to something. There is obviously tension between the great king faction and the current satans as demonstrated in volume 10, and they ordered Sairorg to keep quiet about Regulus, who happens to be a longinus which is powerful enough to kill a satan.