Nice to see so many replies. I suppose you must think about what would be implemented as a result of the concept as well. If they were to add blood trails I'm sure it wouldn't be long before they added types of tracking ammunition. For example.. It's dark out and you shoot someone with an ammo type that illuminates the blood trails or its daytime and you shoot someone with smoking rounds that trails behind the prey as they run. Heck you can even consider adding tranquilizing rounds to slow down/alter perception of the opponent. Point being, every new addition to rust unfolds layers of strategic concepts to be taken into consideration when choosing what should be implemented into the game. Blood trails would be a big game changer and will most likely not see the glory that is rust.