The people coming from Altera had, in fact, not yet traversed the level 3 inner walls at this time. However, it didn't mean that a couple of allies were unable to.
At this time, the houses of the main members had caught fire, especially those with a lot of wood. In the interior walls, some fires burned brighter than others.
One of the gangsters managed to get out, with some of his teammates putting out the fire. "There's someone throwing fire inside the houses!"
He yelled. "Damn! How do the fires spread so quickly?!" Weren't system buildings supposed to be more durable?
They weren't even done speaking when an area of another house burst into flames.
Worse, when they tried using water it to calm the fire down, it spread instead!
Sen, the man in charge of the team guarding the interior wall, paled at the realization. "Oil! They're using oil!!!"