About this scene
Mall central court, weekend afternoon, retail crowd. She's a blonde in jeans and a fitted top, alone, walking past a kiosk. She catches the flash and stares for two seconds before realizing he's caught her staring back. The eye contact lasts about two more seconds before either of them looks away. Both of them are processing the simultaneous awareness. She breaks first, looks down at her phone, and continues walking.
What to watch for
The eye-contact loop is the heart of the moment. Both parties understand the situation at the same time and neither breaks for two seconds. That's a long time for mutual public awareness. Her face goes through three subtle expression changes during those two seconds. The phone-look is the recovery move. She does not actually look at the screen. She is using the phone as cover so she can leave the eye contact gracefully. The walk-away is faster than her arrival walk by about ten percent.