User blog comment:Jojo-a-gogo/What do you guys think the chain on Kurapika's pointer finger does?/@comment-5823092-20121207164418

Maybe its something very Story-Changing, and Togashi wanted to keep the option for that finger open, for whenever some Charakter (I know that he builds the Story around the charakters, thats why all of them are special and behave very different from each other) will go for a step that Kurapikas other Abillities wont do the trick.

Its probably a blocking or evading ability, for when he gets in a very critical situation (maybe like with Feitan or Shalnarks abillity which could be used even before he can use his middle finger)

Its the only thing i could imagine, i don't really think that its for "style" or a very unimportant skill which isnt even worth mentioning, it may even have a harder restriction than his other abillitys like "You can't tell this Abillity to others or you will die"

I hope it will be revealed soon or even in the Movie :)