I seriously doubt that this illustration was meant as anything other than a highly stylized and highly symbolic grotesque combination of the
heart+mind+dexterity to contrive evil by man (in this case a female image)
combined with both legs of the human morphing into serpent tails starting at the calf...
the ancient mind images created by the Church was that day-&-ages
equivelent to the present days slimy & grotesque 'Alien' in the movies of the same name.
good spin and mind journey your weaving,
Oh well , go back to the OP and see the image titled;
15th c manuscript illumination
thanks,