About this scene
Library reference room, late afternoon, dim sun through the high windows. She's in her sixties, reading glasses on a chain around her neck, light cardigan, stack of three books on the table in front of her. She's been reading for almost twenty minutes when the flash happens at her line of sight from across the room. Her head lifts. Her glasses come off. She forgets about the books. She does not move from the table. Her hand stays flat on the open page.
What to watch for
The glasses coming off is the involuntary tell. She lifts them away from her face by the bridge and lets the chain hold them at her chest. She does not put them back on for the rest of the clip. The book in front of her is the same page for the next four minutes. Watch her hand. The fingers spread slightly on the page each time she shifts her gaze. She is fully aware of what she is looking at and she is not pretending she isn't.