Disrupt the Greengill Coast opens up as soon as
Phase 4 begins, and is given by
Captain Valindria. She can be found on board the ship(known as
Silvermoon's Pride) parked in the Harbor which you took in
Phase 3.
Captain Valindria is apparently the
SSO operative in charge of dealing with the
Naga infestation on the southeastern section of
Quel'Danas. Like most people in Azeroth, she needs our help. This isn't just another kill quest, but it
is a kill quest in disguise. I recommend doing it alongside
Don't Stop Now... because you'll be killing the required mobs simultaneously.
It turns out the
Darkspine Sirens are mind controlling the
Murloc slaves you see throughout their camps, and they're doing it using some fancy orbs. An
Orb of Murloc Control is what you want, and they drop off of the aforementioned Sirens. You want to throw and smash them into a camp of murlocs to release them from their control, and turn them on their Naga masters.
What these means is the Orbs work like
grenades, targeted AOE spells, et cetera. When you right click the item, you'll get a targeting circle that the
previous bombing quests have trained you to use, and throw them at a pack of murlocs. You need to free a total of 10 murlocs, so try to get as many of them in the ring as possible to cut down on Orb hunting.
Simple quest, and fantastic to do alongside
Don't Stop Now... as I mentioned before. Doing them together will net you some easy money. Even if you don't do the other quest with this one, you'll still get a pretty decent reward. 11 gold, 99 silver, and 250 Shattered Sun Offensive reputation. Note that this quest doesn't help to progress anything on the island, and will not change once the
Alchemy Lab is acquired and the
Monument to the Fallen is completed.
If you need more information on this quest, please head on over to
Wowwiki or
Wowhead!
Apr 20th 2008 at 11:00AM 
Phase 4 is now well underway, with about 50 servers having it unlocked according to us.gorgonnash.info at the time of this writing. There's still a few more things to unlock, but for the most part, the Sunwell Isle is complete, and what you see is what you get as far as resources and places to fight. So, once again, it is time to ask the question: How do these quests fit into your busy up-to-25-daily-quests-to-do lifestyle? 
