He Needs To Go Back
Cassie doesn't know whether to be happy or horrified. She thought she got happy because the enemies didn't get the incantation, but on the other hand, it was terrifying to think that she was the one they needed to perform the desired ritual for so long.
The real debate between her heart and mind is whether she should tell Blake about this matter. She doesn't know how he will react when it happens. What she was afraid of was that he would hate her and think of her as a mortal enemy because, from the beginning, if it was based on lineage, she was really an enemy.
Cassie will postpone it for now. Even though she knew by this time, the Phobos probably knew what they were looking for.
Why is Mish so scared and said that she knows everything about those cults?
Cassie also knew that stupidity might attack Mish again, and she might say that the incantation might be on Cassie because she was her Grandpa's favorite grandchild.