They obviously changed it for pvp because having an aoe dmg debuff was too powerful completely gutting in pve to the point of not even keeping it on the skill bar.

Free proc... that would mean you would use wide volley which you don't do atm because of its mana inefficiency to dps compared to quick nock nullifying the whole proc chain. Which imo they got all backwards in the first place since you get nock as your first aoe it should proc wide volley and it proc rain and rain have an added effect while making the added affect of say 10% more dmg taken. But, to make this not OP in pvp make it only work when completing the chain similar to the monk silence.