Enthrallment is apparently a common phenomenon in the lower spheres of the afterlife. Some of the spirits on the transitional plane as well as the lower Winterlands and the planes below are more intelligent and have more dominant personalities than other spirits. They can sometimes assert their dominance over the less dominant spirits and create spiritual slaves. It’s not much different than living cult leaders dominating their followers, or violent prisoners dominating more submissive prisoners in our penitentiary system.
The less dominant spirits see themselves as being members of a gang under a dominant leader, but because everything in the afterlife is based on the thoughts and beliefs of the residents, these submissive spirits begin to take on the appearance and behavior forced on them by their chosen leader. Eventually, they fall into a state of slavery in which the dominant spirit can inflict appalling punishments and conditions upon them if they do not conform to the dominant’s wishes. This further affects their psychic appearance and they begin to visualize themselves looking more and more like zombies.
Even conditions like enthrallment eventually pass if the enslaved spirits suddenly realize that their free will is a God given gift and cannot be taken away. This form of enslavement may ultimately be the stimulus that causes the slave to ask for the help of higher spirits. God never ignores sincere cries for help.