About this scene
Suburban sidewalk, afternoon, light foot traffic. She's wearing a pink puffer jacket, hands jammed deep in the pockets, walking at a brisk pace. He flashes at the corner of a low garden wall. Her stride stops completely. Her mouth opens, then closes, then opens again. Three seconds of zero movement. Then she takes one step backward, one step forward, and finally walks past at exactly her original speed. The clip catches her face for the full reaction window.
What to watch for
The mouth pattern is the giveaway. Open, close, open. She's trying to find words and not finding them. The pause is short but absolute. Her hands stay in the jacket pockets the entire time. Watch her sneakers when she takes the step backward. Heel comes down, then the step forward overcompensates by a few inches. By the time she walks past she's recalibrated and her pace is back to normal. She does not look back.