一镜到底不是“镜头绕一圈”：先写清首帧占位与空间走位

[FIRST FRAME] adult female court archivist stands in the left third under a rain-soaked timber corridor; paper lantern in her right hand; jade hairpin two meters ahead on wet stone; courtyard remains on screen right.
[0-6s] slow measured dolly forward. She notices the hairpin, stops before it, breath catches but shoulders remain controlled. Rain and distant wooden watchman's clapper continue.
[6-14s] she lowers the lantern toward the ground without crouching fully; her eyes trace from hairpin to a second wet footprint behind the nearest column. Camera subtly arcs no more than 15 degrees to reveal the footprint while preserving corridor axis.
[14-23s] off-screen footsteps approach from deep corridor. She listens first, jaw tightens, shifts one step backward into the column shadow. Lantern flame trembles; no dialogue.
[23-30s] she shields and extinguishes the lantern. Camera stops. Hold two seconds in near-darkness as the footsteps pass without revealing the walker. Continuous shot, spatial continuity, natural cloth and rain physics, restrained performance, no face drift, no new characters, no costume change.