User blog comment:B214/Volume 22 spoilers/@comment-73.46.6.122-20160819203110/@comment-9595671-20160822030545

@To comment crying about Serafall: Hey, don't worry, she's still with us. She'll just stuck in a seal for a long time fighting against Trihexa's core.

The fact EX shows Trihexa hasn't got out means they have to still be alive facing it, otherwise it might have started to get out which would be bad considering they gotta deal with the UL right now.

Ishibumi may never directly show us, but I'd like to think he's implying they'll make it.