User blog comment:Jopjopjop/Volume 19 Spoilers/@comment-77.253.101.192-20141123093720/@comment-1359322-20141123225902

Yes that's the main reason, but it's also because the pact was broken, Azazel's pact with Fafnir is for Fafnir to assist him in his research as long as he is the Governor General of the FA.