flashback as explanation, causality or linearity which goes beyond themselves in destiny. flashback只是在寻找主角的destiny过程中起到辅助，解释作用的工具，电影《献身还债》因此flashback并没有绝对独立。 明显的，电影《献身还债》作为叙事工具的回忆：a causality which is psychological, but still analogous to a sensory-motor determinism. Despite the circuits, only confirms the progression of a linear narration.
