Virtue of human-oriented photography
The old school street photographer's observation is simply different.
Analyzing a scene on the fly and and go with everything to get it.
The gesture is a great call for my vision and the hands often play a fundamental part, but not only as in this case. I was also struck by the expression of the lady, immersed in her thoughts. Being connected with the street means this. To have empathy for people's behavior will allow you to anticipate the scene coming soon.