The moment Lexie heard Isiah's name she felt suddenly like a wave of heat burned her body, her stomach twitched, her heart pounded fastly, sweat started to cover all of her face and she bit her tongue unintentionally out anger, hate, disappointment and resentment.
She hated the guy her whole life, she hated his face, the way he acted, and his existence in general was a nuisance to her .
The day he died, she was there, she witnessed how stubborn he was, how arrogant and stupid he acted, she knew from the beginning that he was going to end up dead or harmed and that was exactly what happened.
When Ciel told her about Isiah she just stood immediately and went without a single word, which made him very scared.
Ciel on the other hand thought that she was going to tell their leader , and that is why he had to go away on his own.