I got the fact that the aliens lured you out with the blue light, but what was the deal with the skin turning blue? It just seemd sort of stupid Aha - as you are walk into the light the aliens are already working on reprogramming your brain and nervous system - at the very least preparing it to be safely ripped from your carcass.
What were the aliens doing? Switching out their "batteries". By Batteries we mean brains.