Guild Wars 2 Halloween 2012 Mad Memoires XI: Flames of Renewal

Site #9 “Green is the color I want to remember. Not the red of flames of the blackened plateau. The bridge, even it was green.”
The Location of Portia by Arca lake in the Harathi Hinterlands

Once more back to the Harathi Hinterlands. This time head for the Bridgewatch Camp Waypoint. It is to the East of Arca Lake, to the East from the Seraph Landing Waypoint a well. Once there head out along the road going to the Northwest toward the bridge across Arca Lake. Now head along the path until the second fork. Now turn to the Northwest and head a ways there. Stop at the Raw Candy Cone and start scanning. Move closer to the bridge though. It takes some time to get it right. When it does go off right you will find Portia who will run from the bridge over to near the location you started scanning.

When she stops, fire will erupt around her. Use the #2 Aqueous scan to find water nearby. Be sure to immediately roll out of the way to avoid getting burned to death in incredibly short order. When she is safe she tell her story:

Portia: “He burned them all. The whole village. They screamed screamed. And he just laughed and laughed and laughed. (sob)”
Hero: “But why not you?”
Portia: “He made me watch so I could tell the story to others.”
Hero: “Thanks. I'll make a record of your story.”

Afterward she gives you Mad Memoires XI: Flames of Renewal, “In which a rebellious village goes up in flames.”
It has the hint:
Site 10: “Walk in cadence with King Thorn's shattered subjects. They keep their hatred deep within.”