Clarification with Piranhas

No Rune:
Cooldown: 8 seconds
Summons a pool of deadly piranhas that deals 400% weapon damage as Poison over 8 seconds. Affected enemies will also take 15% increased damage.

Piranhado
The pool of piranhas becomes a tornado of piranhas that lasts 4 seconds. Nearby enemies are periodically sucked into the tornado.
Increases the cooldown to 16 seconds.

Here is my question:
Piranhado lasts for 4 seconds. This refers to the tornado.
But what about the “take 15% increased damage” debuff?
A) Does it lasts 4 seconds? or
b) Does it lasts 8 seconds?

Piranhas will deal their dmg over 8s. Tornado lasts only 4s and just pulls enemies in. The 15% increased dmg is applied to all enemies caught in the tornado for 8s.

That’s why for group play, many WD will use the passive that makes locust swarm, haunt and 15% increased dmg from piranhado last almost forever.

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