Certainly damage to the hemipenes occurs from inexperienced people doing it. How else is someone going to become familiar with the procedure if it's not practiced? You are experienced and that you were assisting him with the procedure is good. Hopefully it's just irritated and not punctured or torn internally. Did you guys use enough lubricant, ky, or surgilube prior because that is important as well. Keep an eye out for any bleeding and or swelling the next few days. I would refrain from handling him unnecessarily and keep a watch on the vent and tail regions. Consider a vet if you see any abnormal swelling or bleeding. Stay in peace and not pieces.![]()