Hey ppl im in middle o theives guild quests lv33 Nord and i when i sneak and backstab say a mercenary it only does 2x damage wat skills or how do i get that cut throat one kill scene with a dagger like u see in the gameplay vids....? Any suggestions or advice would be great thanks in advance...

o my skills branches so far are mixed on one handed,block,enchantin,destruction..... actually varied apart from not touched two handed...

As far as I know cutthroat scenes are randomly inserted if your attack does enough damage to be a killing blow. The perks you are looking for are in the sneak tree and are called Assassin's Blade and Backstab.