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At one point, Frea and Giauque are interacting in their usual Vitriolic Best Buds manner even though Giauque just kept Frea from being seriously hurt. She certainly doesn't say thank you, but she does casually toss Giauque a flask of water for him to drink. An option for backstory exposition pops up, and should you choose to read it, you'll learn the story of how Giauque and Lippi met Frea... and how, for the Qish, the absolute highest way to show utmost gratitude is to offer someone water. Once the flashback is over, Giauque raises the flask to Frea in acknowledgement of the gesture.