Write a Backstory "Laura" - Robert O` Neil

Hallo, ich soll eine Backstory zu einer Geschichte schreiben, habe aber keine Idee wie man das macht, kann mir hier vielleicht jemand helfen?

Hier der Text:
Everybody in the crowded restaurant stared when the young woman suddenly threw a glass of wine in the face of the older man sitting opposite her at a table near the window.
The young woman was attractive and well dressed. The man was at least twenty years older than she was. He looked shocked. The young woman suddenly stood up and ran towards the door. ”Laura, come back, please,” the older man shouted. But she had already reached the door. The man ran after her. It had started to rain outside. She ran out into the middle of the street. ”For God`s sake, give me a chance to explain,” the man shouted. She turned around and stared at him. A car had just turned the corner and was coming towards her very fast. The driver had not turned his windscreen wipers on, and he was talking to someone on his 10 mobile. Then - suddenly - he saw her -directly in front of him, so close that he could see her eyes when she turned her head and looked at him.