I snuck behind a quest mob and did "Surprise Attack" almost by mistake.
Lo behold
Sneak + Surprise = one shot

!!!
I never knew Surprise Attack is so powerful and I have been playing Stam NB for like 4 months..lol

The above is my set up.
I run a 2H/2H setup (NMEmbrace/Night Silence) and it is pretty good.
Are there any gear sets/spells changes that I can make which will further improve the damage of Surprise Attack ?