The document summarizes feedback from a friend who watched two thriller film opening sequences to help the author understand how an audience would react to their own thriller.
For the first film, the friend enjoyed parts that created anticipation like hearing the main character's heartbeat during an underwater scene. However, she felt the swimming went on too long and became repetitive and boring.
For the second film, she liked shots that gave clues about the empty and deserted setting, like a window shot. Shots of a man in a mirror and blood in a sink also effectively foreshadowed danger. But she felt the opening became too predictable when the main character shouted and doors closed.
Overall, she advised incorporating suspense but not drawing