Sacrifice Lily? What a Joke! Perhaps if this was the old Zane, then he would not hesitate to knee cap the girl in order to ensure his own safety. No, even that isn't quite right. Lily's usefulness wasn't just as a team member, without her the entire food chain that Gravestone had so diligently built would collapse on itself.
Even if Zane was still a cold and heartless bastard child, he would not have abandoned her. She was too necessary for his continued survival, or at the very least, his continued comfort. Because of this, Zane shocked Gwen by launching a sneak attack on her back when she was focusing her efforts on Lily.
The twin sickles cut deep into the Horde Kings' flesh, rending her skin apart, and spilling her corrupted blood onto the floor.