|“||ARE YOU PREPARED TO SUFFER TO SAVE YOUR SON?||”|
—The Butterfly origami figure
Ethan arrives at an abandoned power plant. His wounds from "The Bear" have been tended by Madison Paige in "First Encounter." He finds a way into the plant by following images of a butterfly painted on the building, or entering through a hole in the fence to the left of his car. He finds a hatch and after opening it finds a long narrow tunnel that is just barely big enough for an adult male to crawl through. At the beginning of the tunnel lies a matchbox. Ethan takes the matches and lights one, using it to examine the tunnel. Finally, he climbs in and crawls into the darkness.
A few feet in, the hatch shuts behind Ethan, and he begins to have second thoughts. He keeps crawling, until something cuts his arm. He looks down and realizes he is facing a carpet of hundreds of pieces of broken glass through the length of the rest of the tunnel. The player must try to move slowly in order to keep the pain at a minimum. If at any time the player's pain gauge (shown by a red, pulsating aura surrounding the screen) reaches a maximum, Ethan passes out and is shown exiting the tunnel and failing the trial. Should this occur, he gasps an apology to Shaun and the chapter ends.
When Ethan escapes the glass-filled tunnel, he finds another, smaller tunnel. Ethan gets in and slides down it at a dangerous speed until he is dumped out of it onto a ledge above live electrical capacitors filling a large room in a grid.
The player can now choose to walk out of a door labeled "Coward," quitting the challenge and failing to retrieve the second set of letters, or they can begin moving through the electrical capacitors. If Ethan is shocked too much, indicated by the same pain gauge as in the tunnel, Ethan will give up and leave through the "Coward" door. If Ethan makes it to the other side, he receives another chip for his phone. It adds more letters and shows another video of Shaun. Ethan walks out, finishing the Butterfly Trial and heading to the motel for the third trial.
- Main article: /Walkthrough
The origami references the fragility of butterflies and how they can be easily injured. Insects are also known to travel toward bright lights. In some cultures, butterflies are believed to be the souls of the dead passing onto heaven, similar to how Ethan must go through these fiendishly difficult trials for his son's salvation. Another reason this chapter may be named the butterfly is how Ethan must crawl through a narrow tunnel, resembling a butterfly's ability to move through very narrow situations (and how butterflies would be able to easily go through the electrical capacitors).
- Coward! – Give up or fail the Butterfly Trial.
- Electrified – Complete the Butterfly Trial successfully.
- Trial Master – Completing this trial successfully contributes toward earning this trophy.
- It's possible for Ethan to find a dead body while crawling through the maze of tunnels. The body is almost certainly that of another victim's father, who undertook the trial in an attempt to rescue his son but failed and succumbed to his wounds.
- The intact state of the corpse indicates that the death occurred recently. This means that it is most likely the body of Mr. Bowles, Susan Bowles' husband and the father of Jeremy Bowles, the Origami Killer's most recent victim.
- The body may instead be that of Allan Winter, Lauren Winter's missing husband. However, since Johnny Winter was kidnapped in 2010, Allan's corpse logically would have either decayed or been eaten by vermin if he died in the tunnel a year ago.
- During the maze portion, if the player holds R2 gently, Ethan will crawl slowly and he will grunt from pain less. However, this does not change his injuries at the end of the trial; he will still have the same scraped arms and knees.
- If the player does not make any mistakes during the capacitors portion, Ethan will not appear with any burn injuries in the following chapter (instead only appearing with the cuts he receives during the maze portion).
- It is completely impossible for Ethan to die (or even become physically incapacitated for the rest of the game) in this chapter, which is rather interesting considering how the broken glass and electrical capacitors are something that could very easily inflict fatal wounds.
- It is unknown how the Origami Killer put the glass in the tunnel. There is one known entrance and one exit, although the killer couldn't have exited through the actual exit, as they most likely would have fallen to their death.
- It should also be noted that the killer's physical stature (particularly compared to Ethan) would make it difficult to spread the glass out. However, there is a possibility that the killer had someone else with a similar stature to Ethan spread the glass out inside the tunnel for them.
Chapters played as Ethan (in chronological order) - Prologue | The Mall | Father and Son | The Shrink | The Park | Where's Shaun? | Paparazzi | Lexington Station | The Motel | The Bear | The Butterfly | The Lizard | Fugitive | The Shark | On the Loose | The Rat | The Old Warehouse
Chapters played as Scott (in chronological order) - Sleazy Place | Hassan's Shop | Suicide Baby | A Visitor | Kramer's Party | The Golf Club | Manfred | Eureka | The Cemetery | Flowers on the Grave | Trapped | Face to Face | Hold My Hand | Origami Killer
Chapters played as Norman (in chronological order) - Crime Scene | Welcome, Norman | Kick Off Meeting | Nathaniel | Covered Market | Shrink and Punches | Jayden Blues | Under Arrest | Mad Jack | Fish Tank | Solving the Puzzle | The Old Warehouse