How does the idea that the serpent is “a reified projection of Eve’s unconscious thoughts” play out in An Archaeology of the Fall?

In this re-imagining of the Fall of Adam and Eve, Keller “put on the costume” of the serpent and played “the reified projection of Eve’s unconscious thought”.  The play went according to the Genesis script, until…

Once the Divine Presence appeared, on cue, Keller could not get out of his costume.  The Divine Presence spoke his timeless lines, then did something unscripted.  He raised his staff as if He were going to execute the “her seed shall strike your head” verse.

Helen, who was witnessing the scene, freaked out and jumped ship.  She thought that her brother was about to get his head bashed in.

Here, just as in the Genesis text, the Divine Presence acted as if He were taking everything at face value.  He motioned to strike the serpent(Eve’s projection) as if it were not also serpent(Keller).

In doing so, It disrupted Keller’s construct.