When Katsuo and Korra got back to zaofu, Suyin was nowhere to be seen.
Korra: Where's su? I have to talk to her.
Baatar Sr: She's not here. She took wing and wei. They're going to sneak into Kuvira's camp and put an end to this.
Katsuo and Korra in unison: NO!
The landscape blurred as Katsuo rushed to the nearest radio station, as fast as her feet would take her.
Then she radioed Kiriko.
Katsuo (thinking): Please pick up. Please pick up. Please pick up.
Kiriko: Hello?
Katsuo: Kiriko! It's me! Suyin, Wing, and Wei are going to try and kill Kuvira in the middle of the night!
Kiriko: WHAT!? We called a temporary truce!
Katsuo: I know, but seeing how they would stoop this low, it's apparent to me now. The metal clan is full of deceitful cowards, and Su's the worst of them all. You have to warn Kuvira.
Kiriko: Man, this is a new low. Even for them. But I'm not TOO surprised. Thank you, Katsuo. I'll let Kuvira know immediately.
Katsuo: I'm just glad I could help.
Kiriko hung up the radio, and Katsuo left with a sense of relief.