Lena figures if it's too personal an issue, he'll just tell her to fuck off. That's what she would do in his shoes.

"You mean they actually keep the sick and don't just kill them?" Lena asks, a little surprised. What he says about killing someone in a rage doesn't surprise her, though. Those that leave the Qun get kind of fucked up in the head. Her grandparents were that way. It's why when her parents married, they left the community full of Tal-Vashoth to carve out a life that didn't involve killing everything in sight.