Your heroine is in an emotional state. Something huge has just happened in her life (she got fired, she broke up with her boyfriend, she lost a big client…) she’s trying to cool off and take a walk.
She sees your hero from afar. She has an instant reaction to him. He’s unaware. What does she do next? Does she keep going and then go back the next day to see if he’s still there?
Does she approach him because WTF, she has nothing to lose? What happens?