The last thing their victims see. So who would you rather meet in a dark ally? Duncan will give you a quick but bloody death, while Niels will torture you mentally for hours until you look like this http://humon.deviantart.com/art/quot-Please-don-t-cry-quot-142297867 before he gives you a quick bullet to the head.
As you can see I was playing around with a different style of colouring. I really like how Duncan turned out.