Thrall: "I wonder what these strange fish-creatures want with us?"
Troll Headhunter: "The murlocs used to be peaceful, but lately they been catchin' us and usin' us for sacrifices."
Thrall: "Sacrifices? To what?"
Troll Headhunter: "A long time ago they started worshipin' some witch. They say she lives under the ocean, and if they don't make the sacrifices, she'll destroy this island."