Final answer:
The provided material does not specify Leni Riefenstahl's second movie; however, it emphasizes her role in advancing film-making through her work on "Triumph of the Will", and it places her in the context of the German film industry's exploration of challenging societal themes.
Step-by-step explanation:
The main answer to the question of what was the second movie made by Leni Riefenstahl cannot be determined from the provided text. However, Riefenstahl is renowned for her influential work in cinematic technique and the documentary form, particularly with her propaganda film "Triumph of the Will". This film, which documented the 1934 Nazi rally in Nuremberg, is considered a significant advancement in film-making. Notably, Riefenstahl's work occurred in an era where German cinema was experiencing a boom, with directors like F.W. Murnau and Fritz Lang exploring challenging themes and the Russian Sergei Eisenstein using metaphoric imagery to tell stories of social struggles. The information referenced highlights the use of cinema, including works by Riefenstahl, as both propaganda and distraction during periods of conflict, as was common in German, Italian, Japanese, and Soviet films of the time.