The black screen happened where the monster is walking slowly towards the player. To go in full detail, I was in the corner and it seems that it did not detect me when arriving at the end of the corridor. So it restarted its animation from its initial position. After that my screen went black but I could still here my footsteps and the shotgun sounds so it doesn’t seem like it was supposed to be a “backstory cutscene” like the other ones…
Of course, no worries about going short on time. My game lacks many things because of time constraints ;)