I'm disagree in all person saying that the third line is not worth in pvp.
I just want to share my damage using the Shadow Dance.
Shadow dance deal twice damage with chakra atack. its like normal+normal/chakra+chakra.
If you used eagles Eye then you max up he Shadow thance the critical damage of this skill is
1200+1200/800+800 for mobs
750+750/500+500 for PVP
in my combo rotation i always use this and its verry effective.
the Crippler is just an additional damage to rotation.
All SW skill is usefull theres no trashed skill except the passive SP passive invi passive acc
kindly check this link