In Origins and Odyssey when ever I infiltrated an outpost and killed a guard and another came across them, at first they were cautious and searching for me, then afterwards they kneeled next to the deceased and said something, then they'd carry them to a corner and dropped them in a hole or off the wall.
They dont do that anymore in Valhalla, they just go in to caution and then move on. Please fix it because i'm sure there is bug not triggering it seeing as it's all build on the same engine and the first two did have it.