Ahiru discovers Rue is Princess Kraehe and that Miss Edel is a puppet who has been guiding them through the story.
Fakir discovers that Ahiru is not only Princess Tutu, but also the duck who comforted him by the pond in "Cinderella".
Rivals Team Up: From Fakir's perspective, this is what he does with Ahiru to find Mytho and save him from Kraehe.
The Unmasking: While Ahiru's identity as Princess Tutu was discovered by Fakir entirely by accident, she chooses to reveal her duck form to Fakir here in order to find a way out through the water. He is both shocked and embarrassed when he realizes Ahiru was the duck who saw him crying.
You Are Better Than You Think You Are: Fakir tells Ahiru that Mytho has always had a fondness for the Princess Tutu character in The Prince and the Raven.