User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-174.119.241.202-20140912164205/@comment-24421137-20140923010425

Would Cao Cao really do such, he is on team DxD, and as I remember Heracles wasn't really all that close to his other team mates, not caring that Siegfried was defeated, so I doubt Cao Cao would risk himself just for them. I think if we ever see them again they might just let them go so they can help fight the new KB.

I think Volume 19 will have small bits of Euclid, showing him in jail, and you get to see what a devil jail looks like, and one of the guards tells him about the prison, and Euclid asks about specific inmates, malbranche, and that's it from him in volume 19.