Too much! The power that Full Moon Rosen had gotten from the Island Mother was too much! None among them would ever imagine that they would be reduced to simple enemies under the might of the overlord who was nothing but a bug before.
Waning Crescent Dragon chose to attack him as soon as he lowered his guard down, so she picked someone that Sinclair was supposed to trust with his life. He didn't hesitate to hit the image of the female dragon. It was as if this New Moon Magnolia was an enemy from the very beginning!
The scent that she embedded in his mind? Yes, she remembered doing so back in the resort where she first met Sinclair and Ainsley. She figured that her pheromones had been deflected by the overlord due to his lack of reaction to it. Never did she think that Sinclair willingly took them in as a measure against her. He even stimulated her, so she would produce it once more.