4 names circle one enemy: the lower carnal mind that keeps a person bound to the body and its fears. This is the mind that deceives the whole world, casting its film over every perception so that a person mistakes appetite for truth and fear for fact. Nothing outside is being defeated here. When the higher wise energy rises through the spine in stillness, this clouded lower nature is thrown down out of the heavens of the head and pinned to the earth of the flesh where it belongs.
Its angels are the smaller compulsions that serve it, and they fall with it, losing their power to govern from above once the seat of awareness is cleared.
Dragon, old serpent, Devil, Satan: one adversary under 4 names, the lower carnal mind that clouds all perception and holds a person to fear and appetite.
His angels: the lesser fears and compulsions serving that mind, thrown down with it and stripped of their rule.
The earth: the physical flesh, the low ground where the fallen mind is confined once awareness rises above it.