[He stuffs his hands into the pockets of his sweatshirt, averting his eyes from the girl, though when he speaks again his voice is oddly matter-of-fact. Detached.]

I get violent, sometimes. Usually during stressful situations, or when I'm around Katniss. I've attacked Katniss before. Tried to kill her.

[After a brief pause he looks back at Rue, to gauge her reaction.]

So that's what happened between us. I tried to kill her.