A man strips down to the state he had employed when he were immediately out of the womb, only to fashion a wide brimmed straw hat. Ashore, and close enough to the rim of the sea for the tide to come to wet his feet, he places his hat where he stands, tracing around it on the sand with a circle of roughly the radius of his stature.
This marks the beginning of his 40 day trial of conviction, in both senses, during in which a stray spirit will notice pensive taunt and try to deceive him into exiting his circle. The man will interact with other people as usual, often receiving necessities and such, and will also face the spirits provocation through them.
The man will find it's best to notice the tide, for it will have the ability to push off the hat from the center of said circle while he is in a state of his rest or inadvertence, which would work in favor of the spirit, but would not be caused by it, for the tide is, with all its neutrality, nature inside the microcosmal circle.
If he fails to stay in his circle, the spirit will have a claim on his soul; otherwise, the spirit will be trapped under the hat, and the claim will be of the reversed nature.