Note:  I’ve edited this post a bit since I’ve had time to sleep and actually think clearly, along with information given by commenters.

There’s been some questions on the forums regarding [Languish], and concerns over an apparent bug if you crit back to back within 2.0sec of each other, the Languish dot will never tick.  Languish will refresh, and the damage of Languish will roll, just like ignite, but you won’t be getting a rolling dot while you keep refreshing >2.0 seconds.  I’m not sure if this “feature” is the same for mages with Ignite, but I’m assuming the mechanic is the same.

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