All the writer tried to do is to encourage the audience to predict what is not been covered, basically. Even the end. You would keep guessing about who was nighthawk ( the slasher)? the doctor? or sarra? grhhh, I'd never know that.
Not that I care.
It was a below average horror movie. There were very few scary scences. Background music wasn't too bad. But this film just fails to creep you out, actually everything that director tried to do, Failed!
Watch this movie when you've got nothing else to do. The storyline(or plot) is weak and doesn't make any sense. Sarra's acting was good. Actually I'd give this movie 3 out of 5 for acting.