“Sympathy,” Zack repeats thoughtfully and turns the idea over in his head. He sort of grasps it. He feels betrayed on behalf of the planets that mortals rape and plunder, and eventually destroy. That's a kind of sympathy. Or empathy. He doesn't feel it for mortals though. They deserve everything they get.

It's quite a novel idea for him.

“I think people are a lot stranger than I realised.” He cocks his head and examines Ben sideways. “Doesn't make them not-dangerous though.”