There is nothing more to say about the creature.

The creature is defeated, and from what you say, there was more to be found in those caves. You have done well, %PCName. Return now to the Skaal village. I will meet you there in a while. There are matters I must attend to.

So he is defeated. It seems there was more to that creature than any of us had imagined. You have done well, %PCName. I, for one, would be proud to call you Skaal. Return now to the Skaal village. I will meet you there in a while. There are matters I must attend to.

You are to kill Aesliip, my friend. Beware, though.

From what I have read in the histories, Aesliip was once a powerful mage who delved in necromancy. As a result of these dark magics, he was made a draugr, but he retains much of his immense power. You are to kill this creature, and perhaps end this madness. Take care with this task, %PCName. This situation seems odd to me.