[ ] Stun Grenade - Off to the right.

In Sewer Corridor 5, Spec Ops soldiers will appear from the right at the end of the long corridor. Take cover behind a crate and engage them. It is recommended to use a frag grenade or constantly move forward due to the initial distance.

NOTE 1: To gain an advantage, dash forward immediately upon entering the room and take cover behind the third set of crates to be closer to the soldiers.

NOTE 2: A cutscene triggers when a character reaches the last set of crates. If playing as Vector and attempting a stealth CQC attack, avoid this area to prevent an early cutscene activation.

After the cutscene, Birkin will charge through the wall. Press left or right with the left analog stick to avoid his swings during the Quick Time Event (QTE). You must dodge three random swings. Birkin may also charge and knock down characters later, re-triggering this QTE.

NOTE: In co-op, healing a downed player during their QTE with a First Aid Spray can be very helpful.

Objective: Fend off G-Birkin until the door opens.

Run from Birkin, but turn and fire at his right shoulder eye if he is behind you. In single-player, you will likely be the one to stop Birkin. Running directly down the corridor from the start can be fatal. Shoot his shoulder eye to stagger him, then run.

Run past flames and steam, stepping aside to avoid damage. Interact with the door at the end to open it. Birkin may get close; shoot his shoulder eye to stagger him if he knocks down a character by hitting the ground. Enter the next corridor once the door opens.

In Sewer Corridor 6, you can rush to the end of the corridor without worrying about Birkin. The main threat is flames shooting from the grated floor. The first player to cross the grating will be knocked down but not damaged. Stay to the sides to avoid the flames. Rush to the end of the hall to complete the stage.

NOTE: If a player dies, do not revive them. Rush to the objective marker. As long as one human player completes the mission, all players get credit.