I think the first question/answer in the Khorne Daemonkin FAQ should answer this for you:
"Q: Could you clarify the Blood for the Blood God! special rule as it concerns characters generating Blood Tithe points when slain? Does this only happen in a challenge or all the time?
A: If a character with the Blood for the Blood God! special rule is slain in a challenge, you earn 1 Blood Tithe point. If a character with the Blood for the Blood God! special rule slays an enemy character in a challenge, you earn 1 Blood Tithe point. If either of the models slain in a challenge was a unit in its own right (such as a model that is an Independent Character or a Monstrous Creature), you earn 1 additional Blood Tithe point for it being slain in a challenge as it also counts as a unit being completely destroyed. If a character with the Blood for the Blood God! special rule is slain in any other way, no Blood Tithe point is earned unless it was a unit in its own right (such as a model that is an Independent Character or Monstrous Creature), or if it was the last model to be destroyed in a unit, in which case 1 Blood Tithe point is earned for a unit being completely destroyed as normal."
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