Cassandra gritted her teeth as the boy was dragged out of the gym, ignoring vlad telling them to pick up the balls, and waiting until she was the last one in the room. She made a pretense at following, before changing direction and following where she was sure they had taken the boy. She hadn't been to the labs before-Cassandra mostly tried to keep herself out of the view of people like vlad, but she knew where they were. 

She was tired of standing back and doing nothing. So this was her doing something as she jogged, catching up with the guards and the boy. She was making no attempt to escape. She was making no attempt to
Be quite. She seemed to glow with grayish yellow light and her eyes were almost silver.