Reminds me a bit of the Shrieks from Dragon Age.
Quote from[Joke] They drop leg joints, which let the player run faster. [/joke]
How a bout implementing a bit of behavior I thought would be fun in a mob but since nobody reads my stuff i can't get into the world; When you hit it it flees for three seconds before resuming its attack. Picture this: You've become lost in a massive cave system, and have no supplies left but the ores you have mined. You spot daylight radiating from what you thought was a coal vein (treacherous texture pack!), and immediately start heading that way. Since you're out of torches, the way is dark and you fall into more than one hole, but as you finally approach salvation a scream echos out of the darkness behind you and as you turn you loose one heart. A pale, waist high shape greets your eyes, and you strike at it with a diamond ore. It whines loudly, and sprints back into the dark. Just when your adrenaline reaches an acceptable level it comes haring back at you. After a few rounds of this you're getting bored, so you knock it back into the dark, build a wall, and turn to go.
See how cinematic that was? Or would be if I were any good with narrative?
Also I like the idea that they retreat. Then it isn't like they run up. Swing, dead. Oh that was easy. With the retreating is plays more on the fear of the player.