Elise didn't like the Librarian. Of course, she disliked all Supernaturals, but this one was not just blasphemous on an intrinsic level, it also actively chose to do things which made her dislike it, as she would if a human had done the same. She wanted to kill it, and as the mirror curse was placed, she wondered if Harold's exclusion from the curse worked both ways - that was, that it could be killed without anyone else being harmed as a result. In the end she decided to assume the worst, as was her habit out of caution. Of course, this would mean that she could kill Harry and subsequently deal with every Supernatural in the building. Her own life for perhaps half a dozen of the vile things... she would consider it worth the sacrifice, were it not for her personal vendetta against Fable. She couldn't afford to make such a sacrifice until her hunt was finished.
Thus, when the Libarian demanded to know who she was and what she hunting, Elise felt her best choice was to comply, rather than simply stab him, as was her gut instinct. So she said "Elise Elwynder, hunting Fae creatures in general and the Changeling Fable Elwynder in particular. I've already given a description of the Changeling."
Fable had to go through the main room. That conclusion was easy enough to reach, but the question of how remained elusive. No doubt Elise had already given a description of her; she could either hide from all of them, or run from all of them, unless she was lucky enough to recieve a little goodwill. What she really needed was a distraction. Elise was busy talking to the bald man from before, and perhaps the others wouldn't recognise her immediately. That might give her the headstart she needed. Then, she had a better opportunity.
Gunshots rang out, and while everyone else was taking cover in shock and fear, Fable had seen the gunman and been able to brace herself for them. She ran, heading straight across the room as a police officer walked in. She'd hoped that the element of surprise would allow her to get past Elise before she knew what was going on. It didn't go quite to plan.
Elise dropped to the floor as advised when the shots were fired. But then she heard footsteps behind her, moving quickly, and she turned just in time to see her twin running for the door. Swinging her leg out, Elise tripped Fable, who rolled and got up quickly, but not any more quickly than the human girl. Elise caught Fable as she reached the door, before she could open it, and grabbed her by the hair to ram her face into the nearby wall. Fable cried out and spun to face Elise, clutching her broken nose with both hands, but did manage to duck under the punch that followed, then spin them around so that they moved to Fable's left, and now Elise was against the wall. However, as Fable attempted to strike at Elise, Elise caught the right hook and pulled on the arm, attempting to send Fable's already-damaged face into the wall again. But they had moved, and this time, there wasn't a wall next to Elise, there were the broken remains of a window.
Fable flipped as her lower body encountered resistance, but her upper did not. Her torso was shredded by the broken glass as she now lay on her back in the street outside. Her head was spinning, but survival instinct had put her body on autopilot, and before she really knew what was happening she was doing something like a run away from the bar. Elise would be through the door in a moment, either giving chase or firing her crossbow. Fable rounded a corner into an alleyway, doing her best to lose her sister. Thankfully, she wasn't leaving a trail of blood, since her t-shirt was soaking the worst of it up, though it was utterly ruined. As quickly as she could, Fable retreated into the gloom, returning to the apartment she didn't own at Ivy View. She found her bed and fell asleep, not knowing if she'd ever wake up, but too weak from blood loss to do anything about it either way.
Elise was not happy. She'd been so close. If that fight had been anything to go by, she was definitely the better combatant. Even so, she hadn't had a chance to finish the job, and now the thing she'd once called her sister was gone. Police were present, and while the fight she'd been in had been fast and vicious (Elise thought it had lasted 2, perhaps 3 seconds) she would now have to escape or face arrest herself. So she did, as best she could, using alleyways and backstreets in an attempt to lead any pursuers on a wild goose chase, doubling back and moving in circles occasionally to fool them. Eventually she found the place she'd been staying at; a safehouse owned by her sect near the edge of town. It was small and uncomfortable, but it was buildings like these that let Hunters from her sect operate in almost any city or large town in the area cheaply and easily. She feel asleep on a matress on the floor, exhausted and frustrated, but also prideful in the belief that she was the greater twin.