"When you've seen someone screaming and paralyzed in fear, it doesn't really make sense to keep the walls up," Katniss says quietly. She and Finnick have that bond and know that about one another. He's known about her fear, the overwhelming sense of anxiety that drifts over her from time to time. She knows about his too - he carries all the weight and fear of what's happening to Annie when he's not with her to shield her.

There's no sense in pretending you don't know a person when you're stripped down that way. She knows Finnick and trusts him with her secrets same as he'd trusted her with some of his own.

"We've been through a lot together, Finnick. I trust you. I have to trust you."