Every muscle in Celia's body tensed when he grabbed her wrist, but she was determined to not lose control. Losing control meant a chance of shifting even without the moon, and she did not want to chance that in a library with other people. Ashton's growl was returned with a low growl of her own before she stopped dead, her own eyes wide as she noticed the change in his.
"What are you?" If she let herself actually consider it she might have been able to put the facts together and guess, but she didn't really want to believe that right now so she didn't let herself dwell on putting the pieces together. "Don't threaten me," she warned, ignoring that he had called her a mutt at least for that moment, no matter how much it bothered her. She tugged her hand back towards herself lightly, hoping he might drop her wrist from the motion, but also realizing that it was not likely.