The film's most devastating plot turn occurs when Edmund, heavily manipulated by his Nazi-sympathizing teacher Herr Henning, decides to poison his own father. The hidden tragedy of this twist is that Edmund acts not out of malice, but out of a perverted sense of duty; Henning has convinced him that the weak must die to let the strong survive, and Edmund's father had repeatedly lamented being a burden to the family.
The ultimate psychological break happens after the murder. Edmund seeks validation from Henning, but the teacher recoils in cowardly horror, refusing to take responsibility for his own rhetoric. Realizing the monstrous nature of his actions and finding himself completely abandoned in a godless world, Edmund aimlessly wanders the ruins. He briefly plays a surreal, disconnected child's game with a piece of debris, before silently throwing himself off the ledge of a destroyed building. The ending reveals the true meaning of the film: the ideology of the Third Reich did not just destroy Europe's architecture, it systemically murdered its future.