The burned cotton is obvious and so was the sweat. But Chang Geng didn't smell anything like tea right now.

"Is that so? For some reason I don't smell the tea. I do smell iron and medicine." What did it mean that they smelled something different at the moment? Either way, even as he asks he's focusing some of his attention on healing that burn. The healing magic comes to him more easily now than it did at the beginning. For something so little, it doesn't take long to heal it.