In Skyre, there is a perk "assassinate" at sneak level 130 that says if you're "behind a humanoid target" you can instantly kill it with a dagger. It did not specify the player has to be "undetected" at that time. I am wondering if it's possible to use this perk during combat, such as when the enemy is attacking your follower or companion, and you run behind and stab them to kill them even though you are detected? Or do you have to be hidden the whole time? If you have to be hidden to use assassinate, doesn't it make it a completely useless perk in light of the fact that one can just use lower level perks "knockout" and "last breath" in succession to accomplish the same exact thing?