Florian wonders if Joana is telling the truth, and if Koch really has been wired. It is now nighttime, and as the ship sleeps, Florian goes to find Joana in the infirmary. She confirms that the soldier did contact Koch.
Florian is as concerned for his own safety as he is about his damaged relationship with Joana. He doesn’t know her well, and so does not know if she is the kind of person to threaten him out of spite. She is not, and told him about Koch because she still cares for him.