The state of being out of vitality points. Once you run out of vitality you roleplay going unconscious. From the Accelerant core rules:

"You are incapacitated and must collapse to the ground. You must close your eyes and you cannot move or speak while you are unconscious. You cannot use game skills unless a skill explicitly explains that it can be used while unconscious."
When you become unconscious you are at risk of Bleeding Out.

Players may open their eyes if they feel they're at risk of being trampled by combat and may need to dodge incoming footfall. Players are asked not to metagame if they do so. From the Accelerant core rules:

"Players who are unconscious close to combat may open their eyes to watch for out of game danger if the battle moves too close. It is important for players to be able to protect themselves during these times. If you open your eyes for safety reasons then we ask that anything you see during that time remain outside the normal knowledge of the game."

That being said, as per the Always In Game clause, what is heard or felt happening around you is not considered off limits, though a player may choose to voluntarily feign ignorance of events that transpired around them while unconscious.