Check the penultimate panel for an extra pair of feet in the foreground. The ultimate panel has a wisp of unearthly smoke in the doorway as well, likely Danny fleeing. Maddie might not know that he's alive, but it's also possible that he's gone off to die, or mend himself in privacy and safety. Or it's possible that the remaining human portion of himself died in that room and all that's left is the fractured half of his ghost form.
But Danny's secret is out at any rate - and then Maddie will have to come to terms with what her hobby (job?) has done to her children, and how cruel she has been to real, sentient beings whom she has hunted for years. Beings that include her child.