Based on the following aphorism of Sri Aurobindo: "Disease is needlessly prolonged and ends in death oftener than is inevitable, because the mind of the patient supports and dwells upon the disease of his body."
Here we see Savitri entering the black pit of inconscience, the very home of Death from where he derives his strength. It is the realm where Death is all-powerful and for a moment it seems that all light is extinguished.