During his flight with Iris it is revealed that Nat is mentally ill, suffering from delusions and hallucinations and possibly multiple personality disorder. This leaves the viewer unsure of how much of the story has been real, and how much has been Nat's imagination.
During his flight with Iris, it is revealed that Nat suffers from mental illness, experiencing delusions and hallucinations, possibly even multiple personality disorder. This leaves viewers questioning the authenticity of the narrative, unsure whether what they witnessed was real or a product of Nat's imagination.