When the lift reaches its destination, grab the First Aid Spray and the Intel to the back right, and use the Green Herb on the landing if necessary. Head out and to the left to reach the back corner, where a Security Camera rests on the wall above you. Follow the path as it arcs around the corner, and pick up the Frag Grenade at the back of the corridor. Keep walking and a cutscene will soon play. Run to the crossroads ahead, where you will see HUNK doing battle with Birkin. Only it’s not Birkin anymore. He will have begun a gross transformation into a B.O.W.
Turn around and run. As you run, search the left side of the hall to find ammo and a piece of Intel. A Green Herb will sit farther down the hall, and Intel and First Aid Spray will sit to the right of the hall. A Security Camera will sit over the door at the end of the hallway. Shoot it as you wait for the door to unlock. Head back towards where the G-Virus was unleashed and run through the door to the right. You will now have to escape from Birkin as he chases you. As you run down this hall, the pipes on the sides of the path will rupture and send flames spewing out into your path. You will have to head to the far side of the wall and hug the side of the corridor to slink by unscathed. If you don’t get all the way to the side, you will catch on fire and suffer damage over time. If you take too long to pass by the flames, Birkin will catch up to you and pummel you into nothingness.
Keep sprinting until you reach the door at the end of the hall. It will be locked, and the unlocking process will naturally take a very long time. If you can’t keep Birkin away from you while the door unseals, you will die. Luckily, he has one giant weak spot. The eyeball growing from his left shoulder is vulnerable, so take aim and hit it as much as you can to delay him. If you have a Shotgun here, you will definitely want to switch to your Pistol, as this task demands a bit of precision. When you hear a “ding” sound, turn around to find the door opening, and not a moment too soon. Sprint through the door to temporary safety.
Don’t waste any time in sprinting away from the door. Birkin will soon burst through it. When he bashes his pipe against the ground, watch out, because he is about to charge. Hit his eyeball before he can hit you to stop the charge. If he manages to hit you, it’s an instant kill. Strafe backwards while firing at Birkin’s eye to keep him relatively harmless. When Birkin strikes the corridor and causes part of it to collapse, your squad will realize that they are in over their head and turn to flee. Follow their example. Turn around and run towards the end of the hallway. Again, you will have to avoid flames and steam as they burst from the pipes in the walls. Weave back and forth between the fire. When you reach the end of the hall, grab the Green Herb on the ground and loot the Ammo Box to refill your guns.
Activate the door. You will have to defend your position from a charging Birkin again. Hit his eye just like before, and wait for the faint dinging of the door opening up. Run through and take a minute to collect yourself. You can trade out your primary weapon for some alternatives here if need be, but note that you will have to face both human and B.O.W enemies during this next brief combat encounter. A Shotgun wouldn’t be a bad choice for the B.O.Ws, who love to get in close. Pick up the Intel in the back right-hand corner of the room, loot the ammo from the floor nearby, and collect the Frag Grenade and the Stun Grenade by the abandoned kennels.