The turning point comes when Crixus is severely wounded. In a moment of pure grit, Spartacus manages to exploit a weakness, blinding Theokoles in one eye before delivering the killing blow.
The specter of looms large over this episode. He is the legendary, undefeated "Shadow of Death" whom Spartacus and Crixus must face in the primus. tokyvideo spartacus 1x05