Getting past the second Wall of Light | Mission 2 - High Overseer Campbell Dishonored Guide
Last update: 11 May 2016
You can get across the second wall of light in two different ways. A more obvious variant is to approach the wall and remove the whale oil tank. In the meantime, you would have to avoid being seen by guards patrolling the area.
A less obvious approach is to take side alleys, and it is connected with the optional quest for the current mission. The abovementioned alleys are on a lower level, and you can get there by finding the stairs, or by jumping down from to that level. After you get downstairs, do not turn right. Otherwise you would run into a pack of rats. Instead, go left.
You need to watch out for bandits also in this part of the map. The first one of them can be neutralized very easily, though. A few steps further, you will witness an argument. You'd better not attack anyone here; cleaning the area is a waste of resources in my opinion, because the only things to find here are gold, Sokolov's health elixir and Piero's spiritual remedy.It is best to wait until the adversaries turn at each other and seize the opportunity to squeeze past them.