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I think you guys are misunderstanding the panels, because thats not the correct order. That was when they first met and the demon 'god' clearly says "how unusual...a living human being" when it first saw emma.
Then emma thinks " A child? Its demon? That couldnt be..." this was her thoughts when she see's that demon.
It was written on the panel with the demon 'god' but it is not the demon 'god's dialog, its a perspective view that showed emma looking at the demon 'god' and her thoughts on it. Since its appearance was like a child and gives off the vibe of both human and demon which is why she sounded confused as to whether it was a demon or not, hence her thoughts being " a child? a demon?"
I think he ask for her brain,I’m sure of it. Plus emma doesn’t have anything important except her family and her life tho’ beside i have a question,didn’t he said emma is a demon child or something like that?
Sorry for my bad english!!