Since you don't have a knife, this is more like a shot in the dark, which deals X damage. You should really get a knife, though. A knife in the dark would be way better. or
You lurk in the shadows, realize you don't have a knife, and settle for a punch from the shadows, which deals X damage. You could use a knife. or
You vanish into the shadows, a terrifying assassin--then realize you don't have a knife for the stabbing. You punch him for X damage instead, and ponder where you could get yourself a knife. or
You duck into the shadows for a stab in the dark, then realize you don't have anything with which to stab. You settle for a shin-kick, which does X damage. You should get a knife. And a life.
With no Disco Momentum:
Half of your ass disappears into the shadows, and you slash half-assedly with your <knife> for X (+Y) damage. or
Your <knife> holding hand disappears into the shadows, then unenthusiastically slashes it with your <knife>. It does X (+Y) damage, but you should try harder. or
You sort of disappear into the shadows, and kinda half-assedly slash at him with your <knife>. It deals X (+Y) damage, but you can't help but feel like you could've slashed <it> more enthusiastically than that. or
Parts of you disappear into the shadows, and one of those parts stabs your opponent with your <knife>. You hit for X (+Y) damage, but you can do better.
With 1 point of Disco Momentum:
You slip into the shadows, almost slip and fall down, and flail wildly with your <knife> for X (+Y) damage. or
You slide into the shadows, and sort of slide back out before he sees you, slashing with your <knife> for X (+Y) damage. or
You shuffle into the shadows, and shuffle back out behind him, cutting <it> with your <knife> for X (+Y) damage.
With 2 points of Disco Momentum:
You vanish into some convenient nearby darkness, emerging only to deliver a vicious and unexpected and terrifying slash to your foe, dealing a vicious and unexpected and terrifying X (+Y) damage. or
You fade into the shadows, silent as the downbeat before a disco tune, and slash violently with your <knife> for X (+Y) damage. or
You duck into the shadows, silent as a disco ball but far better concealed, and slash viciously with your <knife> for X (+Y) damage. or
You slip into a nearby shadow, emerging without a sound to deliver a vicious slash with your <knife> for X (+Y) damage.
With 3 points of Disco Momentum:
You become one with the darkness, and your <knife> becomes one with your opponent's sensitive underbelly, dealing X (+Y) damage. or
You jive into the shadows, not even humming the Mission Impossible theme under your breath. Then you slash with your <knife> for a whopping X (+Y) damage. or
You create your own shadows and vanish into them, your <knife> not even gleaming as it cuts your opponent for X (+Y) damage. Man, you're getting good at this.
Notes
This skill will attempt to use the most powerful equippable knife in your inventory, regardless of whether you are currently wielding it. Any stats requirements apply.
The physical damage appears to be partially based on the knife's power. The spooky damage scales significantly with both the knife's power and your Disco Momentum level.
