The lack of light makes it easy to see the lightning bolt shoot straight up out of her body, looking like nothing so much as a representation of the special effects used in movies like Clash of the Titans. This isn't FX, however, as evidenced when the bolt vanishes through the ceiling and takes out power to the entire hospital with it.

About half a minute later, Clark might hear thump thump thump thump coming from the body, right before it sits up, sneezes, and promptly falls off the other side of the cot.