While in disguise, speak with the Shadowy Initiate, the Shadowy Laborer and the Shadowy Advisor. Then return to Scout Neftis at Grangol'var Village in Terokkar Forest.
Shadowy Initiate Spoken To
Shadowy Laborer Spoken To
Shadowy Advisor Spoken To
I don't know who they are, but I know they're hostile!
I'm going to give you a disguise, and I want you to go in there and speak with three of them that I've observed as being 'chatty'. Talk with the initiate, the laborer, and the advisor.
Just watch out; there're a few hunters in there who'll be able to see through your disguise and they look tough! And whatever you do, don't leave the village -- the disguise is kind of flimsy. If you lose your disguise, come back to me and I'll give you another.