The Bladedancer has a very short duration time, and actually executing vanish uses up a lot of that valuable time making it pretty much useless.
I suggest a buff to enable immediate invisibility without the need for that swivel animation that just takes too damn long!
Just a thought because I really want to bring that into my playstyle. :)
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Just had this talk with a friend, and while I love Hunter and such. i dont think a buff is necessary. Get the extended invis duration. I prefer this for PvE anyways, so nice when you need to rez.