"If you mix that swamp-pig fat directly with the silver-leaf thyme, the acid in the plant will curdle the animal grease," Logan said calmly. "It will feel cold on the skin for ten minutes. Then the trapped moisture will rot the dead flesh underneath. Within twenty-four hours, the patient will have black gangrene in the marrow."Sophia froze. Her jaw dropped slightly. "How... how do you know that?" she asked, her voice dropping into stunned disbelief. "My system recipe says [Combine Cleansing Herb with Animal Lipid for Level 1 Burn Dressing]. It doesn't say anything about curdling acid!""The system gives you a title and an icon," Logan replied, his eyes steady on hers. "It doesn't understand the chemistry of spoiled fat. If you want that salve to heal without rotting the bone, grind two spoonfuls of dry river chalk into the grease first. The alkaline chalk neutralizes the plant acid. It keeps the fat clean while the thyme draws out the heat."Sophia stood in the dim light, her breath