About this scene
First pass, she catches one half-second of it on her way to home goods. She keeps walking like nothing happened. Then she comes back. Same aisle, same direction, slower this time. Then she comes back again, this time pretending to compare two products. Then a fourth time, no product, no pretense, just walking. She loops the same forty feet of mall floor seven times in twelve minutes. By the end she's not even acting like she has anywhere else to be.
What to watch for
The body language tightens with every pass. Pass one is normal speed. Pass three she's got a hand on her hip. Pass five she's stopped using a cart at all. The last loop she walks straight past him with her bag held in front of her, and she's smiling at nothing in particular. That smile only happens when she's already decided how this ends. The video stops before the next part, but you know.