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Not only that, but we can reasonably guess that Leah is at Sequence 7, because she asks them to prepare fire spells earlier, and exhibits no Faceless abilities
This kinda reminds me of the last chapter of LoTM's bonus chapters
She probably knows it from previous incidents similar to this one - iirc someone said earlier that there had been other "Circles"
I think she is an angel, because iirc the other angels had to use their powers/anchors to stave off the GOOs corruption