Mmm, one hypothesis behind the origin of shapeshifting lore is that the witch/shaman (usually) actually practiced bi-location, appearing at a locale distant from the body in the form of an animal, etc. To me this is a far more feasible possibility than the body itself actually undergoing some anatomical and physiological change into another species. If one of the spirits of, for instance, the 72 from solomon's goetia are able to bestow shapeshifting powers upon the magician - probably with conditions - then my guess would be that this is what is meant by that, although some reports suggest that these spirits actually can cause a person to take on a different 'mental' shape.
be careful in suggesting that you 'know' something is possible when you have not witnessed it yourself. Some people will take advantage of that 'knowing' and lead you astray, or take you for whatever they can.
peace
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The world is complicated - that which makes it up is elegantly simplistic, but infinitely versatile.
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