did the traders cove mission for dark brotherhood and i followed npcs routine when they walk around and they repeteadly 'just happened' to turn around once they ended their patrol to spot me. not to mention 1 reveler npc can if im lucky spawn right behind a place i just was 1-2 seconds ago. 2-3 can spawn in same place and it counts as 3 alerts. or guards that detection aura who spawns right infront of you once you killed your target