While Peyton was getting his gear out to attempt to disable the device on Kaika's leg, Umiya decided to talk to Eren.

"I suppose Kaika decided to go after us once she heard of the events happening in the city," she said, somewhat figuring out how Kaika got into this mess in the first place.
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The sudden conversation between Armin and Jean reminded Takahisa on how Kaika would always argue with Nero that she was fine after being in a near death situation. He thought about it while he ate.