What is the penalty for getting hit in assailment stance?

[Periando]

In-game description mentions about penalty after getting hit by melee enemy while being in assailment stance. Does anyone know what exactly that penalty is, how long it lasts and whether it stacks?

[Krindel]

Whenever you take melee damage in assailment stance, you get debuff -5% ranged damage, it can stack 5 times, so maximum debuff can be -25% ranged damage. Debuff will last 4 seconds. I think, if you stay in melee range, but no mob is attacking you, you will not get this debuff.

[Periando]

Thanks!