I was listening to my playlist of music and I was listening to "Animal I Have Become" and I passed this picture. I got the idea of Kankri watching his friend's in a huge battle but because her's just a seer of blood he feels like he can't do anything. He collapses to the ground and just sort of snaps. He see's the blood and starts to manipulate it to his will. He so angry at every thing and every one he doesn't distinguish between the enemies and his friends. I don't know what else there it to it but yeah there you go.