"I never let my guard down," Katniss answers immediately. She doesn't really know how to let her guard down though she thinks there were moments in Chicago where she did exactly that, but it took effort and concentration. It took... a lot of things to make that choice to let her guard down. She can't let it down in a place like this that took her against her will.

She's a survivor at the base of herself. She survives, and she fights like instinct for her.