'Sister!' The man let go of Ferro, sprang at Yulwei, arms outstretched. He got no further than a stride. He gave a sudden, shrill scream and dropped to his knees, clutching at his head. Ferro forced her stumbling feet forward, grabbed hold of his hair with her broken hand and drove the knife into his neck. Dust blew out into the wind. A fountain of dust. Flames flickered around his mouth, charring his lips black, licking burning hot at her fingers. She dropped on top of him, bearing him back onto the ground, choking, snorting. The blade opened up his stomach, scraped against his ribs, snapped off in his chest. Fire licked out. Fire and dust. She hacked at the body mindlessly with the broken knife, long after it had stopped moving.
[...]
'What did you do?' she croaked through her bloody mouth.
'I turned her bones to water. And burned him from the inside. Water for one, fire for the other. Whatever works, for their kind.'
- The Blade Itself, Part II, Her Kind Fight Everything