In the original script, Michelle escapes the shelter and is chased through the farmhouse by Howard, who still wants to "protect" her. She blinds him with bathroom cleaner, he tells her about his tragic life (dead wife, missing daughter, treacherous Nate, etc.), and then she shoots him in the kneecap and runs away. He ends the movie alive, entreating Michelle to "be careful." Later, after traveling down empty roads and finding no one around to help her, she crests a hill and sees the Chicago skyline, smoldering and destroyed. No explanation is given. We don’t even know what she will do next; only that she now knows that Howard, for all his oddity, was correct. The final line in the script is, "She slowly pulls down the mask on the hazmat suit before taking a breath.