It seemed for once luck was on Rachel's side. She had run upstairs to her room because the strap on her new heels was rubbing a blister on her foot, and she wanted to put a bandage on it before it became unbearable. She was at the top of the stairs when she heard the gunshot and she stopped. She was conflicted. A part of her wanted to run downstairs, to make sure Bruce and Barbara were fine, but she had made a promise, and she knew Bruce wouldn't be able to take care of everyone else if he was too busy worrying about her.
She quietly made her way out of sight and then almost ran down the hall to Bruce's room, and into the panic room he had installed. She closed the door and slid down into the chair to wait. She felt like a coward, but she was not going to die again at Joker's hand if she could help it. Now, all she had to do was worry about Bruce and wait for him to come get her. She assured herself he always managed get away, and he would be fine.