Sigh - I came here to find out what I have to do. Do I kill him? Do I get him down to a certain amount of health? What is the goal? I guess I'll edit this to tell what happened when I'm done. Just a note, folks. Not everyone learns well from videos, or can play them in real time while they have WoW running.
ETA: 16% health, 1268k as written in his health bar. He starts to cast Deathbolt, that you need to interrupt. I found that there were soul shards spawning around the edge of the circle he stands in, which helped immensely in keeping my health up. He gives up, you click on him to talk, and Matron Mother brings you home. I had Altruis, and did not get the Shade of Akama, but Akama himself.
I'm surely not the best DH out there, and I may be close to the worst, since I can't seem to get the hang of the mobility aspects. I find these types of comments here help lots more than 'here, look at my video' because I usually cannot replicate what's done in the video.