The document discusses narrative conventions in action thriller movie trailers. It notes that trailers typically follow a chronological order until a climactic turning point, then become faster-paced and non-linear while still building to reveal the main enigma. Trailers employ both unrestricted narrative, giving audiences clues, and restricted narrative, keeping some details unknown to create enigmas. Enigmas are crafted through fast editing leaving questions and using flashbacks that require the audience to piece together an incomplete story.