I think you may need to do more diving, but I'm not entirely sure. Could you describe what you want to have happen in this quest?
I'm not sure I've defined all of these terms on the forum, so let me do that now. There are several different types of content in GH2.
Quest: A one-time event generated when a new campaign is started and thereafter incorporated permanently into the world. New quests cannot be added during play. Examples of quests include all of the mecha arenas, the CometBurger bomber, the Athera Garden concert, and the Theles Spinner ladder.
Rancon: Random Scene Content. Like a quest, this is generated when a scene is entered for the first time and then incorporated permanently into the world. Rancon is fairly limited compared to the other content types, only being able to directly modify the scene which generated it. Examples of rancon include most NPCs, shopkeepers, dungeon rewards, and the "return the katana" event.
Plot: A plot is an event which is not permanently incorporated into the adventure. Plots may be loaded and disposed of during the game. Examples of plots include most missions the PC is offered, the core story components, the rescue scenarios for when the player is near death or trapped somewhere, and the promotion rewards.
Story: Like plots, stories are not permanently incorporated into the adventure. So far in GH2 there is only one story, the core story. Stories load and direct plots.
Mood: A type of content that's been implemented but not yet fully utilized. A mood attached itself to a city and modifies that city's type, thereby changing the plots which occur there. An example of a mood is the "Faction Rampage" which happens in the conclusion of the core story and also in the "I Have Become Death" encounter. Like stories and plots moods do not become permanent parts of the adventure.