FOR NEW SINS - Early-game stealth build

[RrezZ]

Assassin can have a decent stealth build even early-game. I was looking for some early-game Sin builds but didn't find much so I looked at late-game Sin builds and figured I try to make do with the few skill points I have so far. 
BUILD BREAKDOWN: 

1) Windstrike and press RB to teleport directly behind boss in stealth
2) RB, F, RB, F, RB, F till stealth bar almost runs out
3) S, S, (backstep), Shadow Dash (1) for +6 seconds of stealth
4) RB, F, RB, F, RB, F
5) Poison breath (start stacking some poison) 
6) Q to counter and proc stealth and ACID SHURIKAN (more poison stack) 
7) RB, F, RB, F, RB, F,
8) **SHADOW DRAIN** (recover 6 seconds of stealth and full focus bar) 
9) RB, F, RB, F, RB, F,
10) Backstep and Shadow Dash for +6 seconds of stealth 
11) RB, F, RB, F, RB, F,
12) Repeat steps 5 through 11

 

Demonstration: