After the animation turn around, run down the stairs and kill the enemy at the end of the corridor.
After that you have to take the elevator down to examine the dead clone body.
When another cut-scene ends, jump to the nearby hatch and run forwards as fast as you can. You have to flee from the creature chasing you.
Behind the first door you'll encounter another one, overgrown with red glands. Shoot it and go through the door.
If you are grabbed by the monster on your way, quickly swing the analog to free yourself.
Run forwards until you reach a hatch with the red handwheel.
Behind it a large face of the beast awaits you. In order to avoid being bitten, move slowly to your opponent and then quickly run away. When the creature starts to get back, you can run to the other side. Use the same method to pass by another face in the corridor.
Get rid of the third face by shooting the blue container on the ground. This will give you time to open the hatch on the right.
Go forwards until you see the opponent again. You have to escape from him, running straight ahead as fast as you can. If you get caught by hands, quickly swing your analog and run forward, sticking to the right side of the tunnel.
After reaching the end of the tunnel, shoot the blue container on the ground, thus scaring the enemy off.