Fair Play has a long-winded ending, commencing at a party right after the conference where Luke has created a scene. Emily finds him at the party in a less-than-presentable state, and they have a violent confrontation in front of everyone there, which then becomes a private showdown in the restaurant bathroom. One thing leads to another and the duo become intimate, but Emily soon starts to feel uncomfortable and asks Luke to stop, which he doesn’t, assaulting her and then disappearing from the scene.
Emily makes good with her boss the next day, having decided to break things off with Luke after the assault. She proceeds to lie about having been stalked by Luke and asserting that there was no relationship between them.
When she returns home, she finds Luke packing up to go live with his brother, unrepentant about his actions the previous evening. It is then that the power dynamic changes and Emily decides to respond with the same calculated cruelty as the kind Luke has subjected her to throughout Fair Play, cutting Luke down bit by bit until he is begging for forgiveness, bleeding from the literal cuts she has inflicted upon him as revenge for the mental and physical trauma he has wreaked upon her. Finally, having gotten out of Luke exactly the apology and admission of guilt that she wanted, Emily orders him to clean his blood off the floor of the apartment and get out.
The ending of Fair Play is less about the settling of scores and more about the reassertion of the agency a woman like Emily would normally hold on to doggedly but which, in this case, she has let go of in order to keep the peace in a relationship that appears to be on the cusp of something more long-lasting. When the relationship has clearly collapsed beyond redemption in her eyes, she claws her way back to a position of power and self-respect, now unafraid of damaging her significant other.