Normally, a walk-in occurs when the person decides they do not want to be in the life anymore, for whatever reason. They want to leave, but suicide is not an option. Why destroy a perfectly good vehicle when another soul would be more than happy to use it. So they make an agreement with another soul (usually one that they know and have association with) that they will leave, and the incoming soul will take over the body at that exact moment. None of this is done with the conscious involvement or motivation. The consciousness of the person usually has no inkling that anything has occurred,
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