"I have already planted a mind seed on Alice's subconsciousness. If something ever happened to her, I can protect her and prevent her from being kidnapped by those from the organization that the mastermind is in."
Alister replied to Lynn's question, assuring her that he wasn't cruel enough to abandon his sister.
Although he knew that Lynn wouldn't mind if he didn't save her sister, Alister didn't want to neglect his younger sister when he had the power to save her. He might not care about other people who were strangers to him, but Alister still cared about those who were close to him.
When Lynn heard Alister's reply, she breathed a sigh of relief that Alister hadn't lost his bottom line yet. Although she would still support Alister if he wanted to kill anyone he saw in his path including herself, she didn't want him to lose his humanity due to that.