In fact, he feels so strongly about the film’s right to ambiguity, that, at a question and answer session after the film’s first screening (in September at the Venice Film Festival), he yelled at his brother for clearing up an important plot point for a confused audience member.
"My brother, doofus that he is, went ahead and gave an answer, and I clocked him right afterwards and said 'you’re a f—ing bonehead.' He has this one interpretation of the way the film goes, but by doing that he’s misinterpreted the whole film. We all [Christopher, Jonah, Guy Pierce and the producers] had a nice long argument about it. There is no objective truth. It would totally betray the concept of the film."