Incarnation is the process of a soul entering a fetus at some point before birth. Most religions, including Christianity , believe that this occurs and it is what distinguishes man from all other animals.
Incarnation is a normal process, part of the regular human life cycle.
The original soul is still in the body but does not have control of the body. The demon can be cast out by the power of Jesus' name used by a believer . This man lived in the tombs, and no one could bind him any more, not even with a chain. No one was strong enough to subdue him. And he begged Jesus again and again not to send them out of the area.