Something quite common that happened when a person got carried away was that they tended to be careless; in Desmond's case, this was not reflected until he realized that his beloved new pistols were now covered in blood and brains.
Looking at the missing pieces in the skulls of the people he hit with the shafts of both guns, Desmond had to accept that it was a pretty grotesque scene and that maybe, he had gone too far.
The frustration didn't last long; as a highly capable Elementalist, Desmond needed no more than two seconds to cleanse his weapons with a wave of water that removed organic materials stuck in some of the weapon's internal mechanisms.
"Note to me for the future, due to the size and weight, these pistols work quite well as blunt weapons. Side note, remember to cover weapons with mana to increase damage and prevent them from getting covered in human remains."