She died as a result of fire injuries at St Luke's Hospital half a year before the events of the film begin.
Sure they saw them behind a wall sometimes, but they never looked down a hallway, maybe through 2 or 3 walls and predicted movements to decide for or against a path or set up any sort of suspense that they might meet soon, or utilized it during a chase in the ever changing hallways.
Far luckier were the following sci-fi and horror movies, each of which was rescued or at least greatly improved by gratuitous nudity.
Our dog was turning its head, looking down.
A tourist claimed she captured the figure on her flip camcorder.
So part of the joke is already set up.
So I built a second one.
The only problem is that grandpa, the man in the photo, died 13 years before.