When I experienced this, my left heel was stabbed with a thick needle-like “tool” and a hose was attached there. After that preperation, Lilith’s blood was injected through my heel.
A lot of my experiences is very graphical, since I feel energies and spirits on a physical level. It often leaves a visual residue, too. Medical tools are often used when they heal me, as well as when they work on my ascent and astral transformation.
If I didn’t know of my experiences, it could easily been mistaken as an “alien abduction”.