AHA. Yes, you noticed! Depending on Brit's headcanon, it could either just be part of the mask, or actual blood from the people he's killed. (:3a

or maybe I'm assuming too much lolo it just looked nifty. XD;

Aaaaand yep! Seriously, my first thought with a guy in black with a white mask automatically went to No-Face. And then the arts just kinda took over, pft.