I don’t think this violates Rule #2. I hope you consider it research of how soldiers talk among themselves.
When Uhtred and Athelflaed rode out to parley with the Northmen, their leader farted. I immediately thought of something I had heard said among soldiers while I was in Vietnam. I pictured Athelflaed saying “your voice has changed but your breath smells the same” and pictured Uhtred nearly falling off of his horse.
It is not something I thought of, it is something I heard soldiers jab each other about.
Edward J Marty