This city could be viewed as a special dungeon.
The aggression system no longer assessed the identity of the unit, whether it be player or monsters. Instead, aggression was now assessed by an intelligence. Once the NPCs discovered that you were a player, then it was game on.
The other difference was that players weren't allowed to kill the local people who lived here.
If they killed them, a red name would appear above their heads for five minutes. This would make it obvious to everyone that you were a player.
As such, Lu Li chose to only knock out the NPC.
The winning condition for the match was to have the highest score, and points could only be obtained from killing other players.
Most people died during the first minutes that they arrived in the city because they didn't know how to camouflage themselves.