There had been a bubble of space around Valerie (and by association) Dorian, after she had pushed the other player to their death. This may well be the space that saves both of their lives, when the doll's head snaps around.
Valerie jerks to a stop, as does Dorian just ahead, and through the hubbub they both remain still. Valerie is used to using waxed cloth in the alchemy lab when she's expecting loud noises, but things do go wrong unexpectedly sometimes, and a shaky hand or jerky reaction would have her long dead. She sees a figure jerk their head at the mysterious cracking noise, and a moment later death comes for them as well.
Ahead of her, with vision sharp from fear, she can see the nearly imperceptible movement of Dorian's slow, controlled breaths. Her chest is burning with the want for more air, for her to heave for breath and sate the hunger, but she will not be controlled by her impulses. Mother taught her better than that.
While the voice reads out the names, Valerie remains as still as she is capable of. Even her eyes stay fixed on Dorian, where they landed instinctively when the doll's head turned. She can tell that the symbols above the doll's head are changing through, and she thinks she understands what is happening.
The symbols are numbers-- that connection was built when the first death was announced and the word 'fifty-six' was spoken, becoming an idea she knew. Then the guard had said they had five minutes and the symbols on the wall started changing, so they represented the time. Even knowing this, the numbers have not been translated into ones she knows, so she's forced to learn the associations between each symbol and the word a guard or announcer uses. How frustrating.
If the five minutes given to cross the room includes the time the doll is turned, as the continually changing number suggests, then her and Dorian's chance of success is nearly arbitrary and entirely dependent on whoever controls the doll.
Does the doll not turn until all the deaths have been read out? If so, then she was more dependent on her fellow players than was at all comfortable. Perhaps she could tell the other players to spread out more to avoid collisions, or maybe the deaths only delayed the turning of the doll's head if they happened during a frozen period. Ideas, both collaborative and combative, churn in her head as she keeps her gaze on Dorian and her focus on the doll's head on the edge of her sight.