Read Prima's free inFAMOUS: Second Son walkthrough.
Depending on whether you chose the path of Good Karma or Evil Karma, your save file will reflect one or the other. From here on out, your actions will either progress along this chosen path or reverse them. If you chose Good Karma, make a point to heal civilians and subdue fallen foes rather than going for the execution. If you chose the Evil Karma option, feel free to approach each situation with reckless abandon.
This mission mainly serves as a launching pad for the story and is full of cut scenes. When you regain control, take a moment to walk around and explore the Longhouse (now converted to a triage for the wounded). Move in the only direction you can, eventually reaching Betty. After she falls asleep, join Reggie and end this very brief mission.