Question: When Andrea escapes the Governor by releasing the stairwell of zombies on him, it does not look like she is actually hiding behind the door but that she is in the actual stairwell where the zombies are or in a different room. Some insight into this would be much appreciated.
Answer: She is behind the door.
Answer: When the governor walks towards Andrea she opens the door that's filled with the walkers, she goes behind the door while leaving the governor to fight off the walkers.