Dont listen to him! Go Blood Spec, back peddle, and kite him. Make sure you keep up your blood shield by using Death Strike, utilize icebound fortitude, vampiric blood, and rune tap, and you should be fine! If you skipp the quest, whenever you come back to Ebon Hold they will always be hostile. You won't be able to runeforge or learn or change dual talent spec. Or, you can leave ebon hold and come back at a higher level so its easier!