Suspicion is something that Katniss has in spades tonight. Unlike Buffy, she doesn't hide her suspicions all that well. Katniss has made it clear form her arrival (maybe even before then) that she doesn't want to be here. Prim is the only person she'll lie to about that and even then, she knows that her sister will see right through her. But the point is that for Prim, she's trying. For everyone else, well, she can't bring herself to care.

But Buffy isn't exactly everyone else. At least, she's not part of the horde of unfamiliar Alpha faces that seem to fill the hall tonight. They've talked a few times and although she still doesn't entirely know what to make of the girl, Katniss knows she isn't so bad. So when she encounters Buffy at the buffet table, although she can't bring herself to smile all that easily tonight, Katniss does offer a simple, "Hi."

...It's a start?