In the excerpt from "An Echo in the Bone" by Diana Gabaldon, Jamie expresses concern for his companion's well-being after inadvertently making them laugh. His alarm reveals the seriousness of the situation, as he fears that their laughter could lead to complications, especially if it results in coughing that endangers their health.
Jamie is particularly worried about the reaction of Jenny, someone who clearly holds authority or influence in Jamie's life. His mention of her strong emotional response underscores the depth of his concern for the loved ones around him and reflects the tension between humor and the perilous circumstances they find themselves in.