If she weren't so concerned about her own situation with Derek, Katniss would probably sympathize more with Buffy. She has her selfish tendencies, no matter what people back in Panem might otherwise think of her.

"Cause." Cause she's a bad person. Cause she gets people killed. Or tortured. Or kills them herself. Cause in all honesty, she's not someone worth knowing. And if Buffy is so concerned about protecting her friend, the best thing she can do is convince Derek not to help Katniss. But that's a lot to say and she doesn't know where to begin. "Cause I'm the one that kissed him," she finishes lamely. "I shouldn't have done that."