The beauty of this game is that it gives you multiple ways to do a quest and even if you stuff up, there is always another way to progress. For example, I was supposed to get an item from an NPC but there was an "altercation" (oops) and the NPC ended up dead before I could speak to him. However, the quest item was still able to be looted from his corpse...so no biggie. Regarding Griff...I recommend killing him rather than completing his quest. You can free the elf by looting the cage key from Griff's body anyway and besides you get better exp and loot by killing him and his gang. You can also talk to the archer on the balustrade above Griff and she will join you in the fight against him.