Given the question: Generate a question about the following movie plot: As radio show host Erica Bain (Jodie Foster) and her fiance David (Naveen Andrews) are walking their dog at night at Stranger's Gate in New York's Central Park, they are attacked by three violent criminals who film the whole attack on their phones. David dies from his injuries, and Erica, while seriously injured, survives. Angry and traumatized, she attempts to purchase a gun. Terrified and unwilling to wait the month required to obtain a gun legally, she buys a Kahr K9 semi-automatic pistol from a black market gun dealer. When she stops at a convenience store, a man comes in screaming at the female cashier for not allowing him to see his kids, and shoots her. The killer then hears Erica's cell phone ringer, whilst attempting to clear out the till, and stalks her in the aisles. Just as the killer is about to find her, Erica is overcome with fear and shoots through the aisles and kills him. On another night, two street thugs harass and threaten passengers in a subway car. The passengers all leave at the next stop except Erica. When the thugs, amazed that she wasn't threatened enough to leave, take it as a challenge and threaten her with a knife, Erica shoots them both dead. Another night, she attempts to save a prostitute by threatening the brutal pimp with her pistol. When he attempts to run them down with his car in retaliation, she shoots him in the head, but not before he runs over the prostitute. The prostitute is injured, but lives, and is taken to the hospital. All the while, Erica attempts to track down the thugs who killed David. She strikes up a friendship with Detective Sean Mercer (Terrence Howard) who is investigating the vigilante crimes and who is initially unaware of her role in the deaths. Erica, in trying to find out if the detective is close to solving her case as well as the vigilante killings, pretends to want to interview Mercer. During the interview the detective asks her how she pulled it back together after her tragedy. She replies that she didn't, she had to become a different person...
The answer is:
Who does Erica rescue?