Chapter 7

Chapter 7, "Enemy", is the seventh chapter of Act 1 of Exit/Corners.

Synopsis
(From this point on, an in-game synopsis is available in the form of a "recap" of each chapter at the beginning of the next one. They are in the form of Ink's thoughts as he thinks back on what has just happened.)

Amidst the infighting happening between the contestants, Ink beckons Aether back into the boiler room to have a private chat in which they devise a plan to unmask Sent's true nature.

The others are wary of the two when they return to the hallway, threatening to lock them permanently in the boiler room should they not confess what they were up to; Ink persuades them into focusing on the puzzle first. After it's solved, Sent emerges on the screen to debrief their next course of action.

Their speech is interrupted by Aether slapping Ink, causing everyone to realise Sent was also distracted by it, meaning they're watching them in real time and therefore can't be one of their own. Sent is impressed by Ink's wit as the latter thoroughly explains his gambit of figuring out how to reveal the former's identity; they then leave the contestants to let them figure out the following room by themselves.

Before they can do that, however, Liza begins to feel sick and vomit blood, just like Ink did not too long ago...

Puzzle
The solution for the puzzle can be found here.