mmm you kill a ton of zombies and they bleed. You have to walk over them to find hidden things, and when you walk away you leave bloody footprints wherever you go for a bit.
It's really rather funny cause the blood is to red to be blood and there is so much of it it's kinda rediculous like you put one bullet in this guy and he bleeds a gallon of ketchup but the games a really great game I just finished as Sculley today and will be starting as Mulder next chance I get O ya and you have to do autopsys so yes there is blood there too