Board Thread:Questions and Answers/@comment-25787298-20151017045449/@comment-26841482-20151017145810

Nah, I don't think that it's clotted blood. It's more likely the flow of Rc cells into that shape of the kagune. It's an Ukaku, so RC-cells have to flow continously and replace every empty slot of the crystalized RC. So the higher concentration in the areas that are being replenished after the shots have been fired, and that leads to the different shades of red.

Also, one has to be highly observant in these situations. 😎 Otherwise, many mysterious will remain unsolved.