I really like this series and the story that goes with it. Love the way they trade the mistery for violence/action as they progress. I know it's not easy but I think it would be actually perfect if it was a little longer, perhaps in 5 parts or so, not more but enough to allow the themes to develop more.
About this particular part, I really like the art direction. Obviously the colors match the setting but I think the way you painted it also works well to transmit the feeling of heat (in both literal and figurative way). The character design is also good and the hatred is well portrayed in the assailant's countenance.
On one last note, if you haven't already, you should check out my favorite painter, Francisco de Goya, as I think the way he depicts "dark" subjects is simply amazing and especially considering it was 200 years ago!