The bloody handprints on the face of the mannekillers was probably a solid clue, but this just confirms it. Pixel recognized the rune on the sword piece, and knows there’s a handful of things you can make using that rune, plus the coloring of the wedge and all that. She was just trying to see if she could get Iza(nagi) to cut himself on it. Which might not have been the most mature thing to do, cause who knows what will happen when the shard gets charged with blood?
Edit: Fixed the wrong handed blood splat, Iza’s tie switching left over right-edness, and colored the inks.
Double res version will be posted over at Patreon. $1 and up, but feel free to contribute as much as you like :)