Horace sits in the very next scene with the men at the bootlegger's house, speaking of his wife and his reasons for leaving her in terms that both repeat and refigure the vomitory terms we've already encountered.
Horace "knows" he isn't the stain--knows he is not the vomitory (no)thing that Popeye reflects back to him--because he has already learned that this stain refers to a female emission, and it's in the name of exactly this "knowledge" that he in fact flees from his wife in the first place.
The vomitory confusion between inside and outside--which threatens the subject with self-consumption at the hands of a bad object outside-within--is stabilized by an optics that no longer finds a "self" in the object at all, but projects the threat of psychic self-canceling onto a feminine externality whose revealing-concealing natural artifice formally repeats the original experience of being a self-negating nothing.
Popeye's hand is her father's hand--and her father's hand is Popeye's--since if Popeye is on one hand "Daddy," Judge Drake is on the other Popeye, both in the mode of vomitory (no)thing and of its sexually violative denial.
To be smeared, on the other hand, by the novel, into its vomitory textures, is to be forced to "see" oneself instead as Popeye-Temple: victim and victimizer, subject and object, eye and mouth, culture and nature--and of course, perhaps most importantly, masculine-feminine, (wo)man.
129; my emphasis), we might in the light of what we have gathered rewrite the statement as follows: the vomitory (no)thing which I try to call "woman" is one that "corrupts" because it's already (in) me, and because the novel demands "I" consume it in a ruinously masculine and ocular ingestion that prevents the thematic imbibing of significance.
I'm suggesting that Sanctuary may be thought to effect just such a "sliding back" in the visual, to eclipse the image of bodily integrity with the "background" of a body in bits and pieces, and to do so by forcing vision to discover a vomitory object that "is" the self in the place where reflected unity should be.