Run through the room to the door by the red sign and it was locked. Turn around because you are now in a lockdown. Once you took the swarms of enemies out, run through the door with a red sign to the right. Run down the hallway and through another door where you would come face to face with a headless corpse and copious amounts of blood. Head through the door to the right and enter and go down the hall. Turn to the right at the crossroads and follow the winding path around. Continue straight ahead, open the door and wind around to the left. Run through the door. Continue down the hallway and keep running down this straight corridor as well. Instead of going through the door here, run around to the left by the red devices and open the door to your right. Run through the center of the panels and take the Necromorphs out here. Run past more red panels and head through the door. Keep moving forward. At the wall, turn left to go through the door. Run forward and into a side room to find another battery. Pick it up with Kinesis and go back through the side room. Open the door and still holding the battery, continue down the corridor.
Use Stasis on the gate that kept opening and closing in order to pass through it and grab the battery and enter the room. Place the battery in the open slot to the right of the door here. Run through the now open door and immediately to the left. Turn right and advance forward and turn right to go down a spacious room where you saw yourself reflected in the distance which are more hallucinations. As you neared the illusion, it would change into a Necromorph so kill it. Go forward from here and turn left at the "infidel" window by turning left past the flesh-like material and down the hall. You would see a door on your right. Go through it and find yourself in another room that was surrounded by the red panels. Run to the end and find yourself in lockdown again. You knew what to do. Once it was cleared, run through the door and into a suspected hallway to end the chapter.