In Scene one, Sarah is seen drinking and driving at night time.
In scene two, Lexie is seen coming home from a family event, completely sober, focused and alert.
In Scene three, the intoxicated Sarah sees Lexie's car and decides that it would be a good idea if she were to swerve into her and scare her as a joke.
In Scene four, Lexie is shown scared and in complete shock, as she realizes Sarah is going to hit her.
In Scene five, Sarah purposefully swerves into the wrong lane, hitting Lexie and killing her on impact.
In Scene six, it is shown that a police officer passed by the intersection after the crash, not witnessing it but rather arriving just after it on patrol. The officer then calls the paramedics who save Sarah's life.