A man on my bench poured me tea into his thermos cap without a word

I was freezing on a bench by the Vistula boulevards at Powiśle one December evening around 5pm when a man on the same bench poured tea from his thermos into the cap and handed it to me without a word. We talked about the river for an hour. He told me where to find the best views in the city, all of them within a kilometer of the bench. We meet at the same bench every Friday with two thermoses now. I think we are both secretly saving the cap.