flowers and thorns

She knew what she was, but kept it secret for her own protection.
He knew what he was, but didn't think it mattered.

Until one day they recognize themselves in a battle for life and death, in which you have to turn into hunters and hunted.
Until one day they look each other in the eye and don't know if they're friends or foes.
Until one day, everything they had, and the fate of the world, is on knife's edge.