Whenever you see this set activated you can block for a second or a bit more and then it is safe to leave the circle. Since set pulls you in after one second of activation. Then just roll dodge out.
Major Evasion with block helps a lot, especially if your skill has snare immunity as well (like Shuffle or Phantasmal Escape on NB). Personally, I keep a safe distance from others in my group in pvp because DC users will always target the tightest crowd they can find. Once Dark Convergence is on cooldown, then you go in for the kill.
I have a really hard time when a fear gets dropped with it, I can't seem to break free and get out.
I also die during dodge roll a lot so I usually hold block and try to walk out.