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I accepted to help Nalenteris Brendu in his quest and found the Ogrim, so far so good.
The creature was peaceful (wasn't attacking on sight) and I could not find a way to let Nalenteris attack it without hitting it first myself, as this would angry the Ogrim and start the fight.
I ended up manually updating the journal to succeed, I got my little reward but the guy wouldn't stop following. We then payed a visit to his father and as expected he thanked me for assisting his son and gave me a discount.
Long story short, I got myself a companion. We traveled together for a while, then a combination of Port Telvannis walkways and poor pathfinding killed him.
Now his father hates me!