Hello Nsijsi,
I'll admit this is a pretty confusing excerpt and question, but let's try to work it out. The title of the piece is "An Invisible Thread." Let's think about what that means. A thread can be tied to many things and can connect a series of events and outcomes. With that in mind, read the excerpt and think about how that applies to the story; particualrly, how it applies to the woman with change and the man asking for it. Look for causes and effects in the text. Here are a few:
Action: Man asks for change
Outcome: Woman walks away, ignoring him
Action: Woman changes her mind and turns around while in the middle of the street
Outcome: Woman almost gets hit by a car
etc...
What do these causes and effects show? (Particularly about a thread of consecutive events)?