As he used to, Peeta's able to twist his words to smooth out a situation and make everything better. He compliments Tigris and is able to pay her, in a certain sense, for helping the rebels out. The fact that the rebels need a stylist's help reinforces the parallels between the situation they're in and the ones Peeta and Katniss endured during the Games. Then, as now, they needed the battle armor that could only come from a "brilliant stylist." It's no accident that "brilliant" is the same word Katniss used to describe Cinna (1.34).

Katniss is so overcome with emotion that she feels "cracks begin [to] open" within herself, just as they opened on the street mere moments ago. Her sense of self is being ravaged by the war just as the Capitol city is. Here, she fears she's sacrificed Gale unknowingly – that she didn't protect him (by killing him) the last time she had a chance to do so.