MUTILATION

is all this movie is about.
mutilation of time(starting with the end of the night and going backwards), mutilation of space(with chaotic camera movements that leave you really dizzy) mutilation of the characters(going down to the deepest/darkest places of human nature), mutilation of the storyline, mutilation of sound, mutilation of...bodies.
"time destroys all things", just like this movie destroys every one of its elemnts, to give a very strong, unmerciful tale of revenge and the "value of life".