The Effect of Boogancy on Psychokinetic Lightning

The idea of buoyancy is one possible explanation here. It occurs to me that one way that could manifest would be just like we use our muscles to navigate our environment and hold ourselves up and assume postures. We might be doing something similar just as an assist with psychokinesis. And the removal of a soul or the change in focus, even if nothing's leaving the body, may affect that psychokinetic lightning in a way that makes you appear heavier on a scale.