Fan theory: Dark is also a plant. If you listen carefully, 80% of everything she says and does facilitates the experiment. She gives an expository about the company, translates the CEO's French, never gives any misleading information during the experiment, and she highlights the fact that the corporation could have plants. It feels like she performs a similar role to the CEO, they are both there to drop hints to assist the candidates in their interview process. Moreover, she did not tap out when threatened to be blinded by brown. This is highly irrregular human behaviour, and the only logical explanation points towards her knowing that the miracle cure already exists. Therefore, no physical harm caused in the room has permanent consequences. Lastly, I do not believe that her ejection was an accident. Her speaking to the camera and making her exit was part of the script she was given. She was meant to take her leave after giving all the necessary information (just like the CEO and his spectacles).