When going down the corridor just before teleporting to the lab, face diagonally and right. Keep going forward during the fade out, and spam click right in front of you. If you did this right, you’ll hear the door open. To go into the door, you can either turn around and walk forward, or walk forward and right without changing your camera angle - it’s hard to get the timing right, you can judge when to go based off of the sound the door makes. Do this correctly and you should activate the fight scene around the same time you regain your vision. Finish off the run, and you’ve got a PB!