Deactivate molecular cannons | Reclaimer Halo 4 Guide
Last update: 11 May 2016
In corridor, follow guards who'll open doors for you. At some point, you get to the room (screen) where you deactivate molecular cannons.
When Cortana disappears, turn around and head to door you entered here. In half of your way, a passage will be open on right. Then you get to the big door with five guards. When they're open, walk into a blue beam of light.
After a cut scene you find yourself in room with Crawlers and Knights. On left you'll see a terminal from which you take out Cortana. Staying nearby it, kill all enemies.