As she pulled out her sword, the duchess began to convulse and fell to the ground, vomiting blood. Vaughn shouted and immediately knelt, shaking his mother's body.
Mona expected the dream to end, but what surprised her was the attack she received from the duke. She wasn't expecting any strong reactions from him, since she believed he was just an object of the dream. But the duke reacting that way only means that the dream is still continuing. The kid's subconsciousness is still making the object react according to what fits reality.
She dodged the duke's sword. Afraid that her real body might acquire the same wounds she'll get. The guests had long run away from the commotion, and what remained in the set was only the four of them. It was like unnecessary objects were being discarded and forgotten once the mind focused on the main object.