That horrible.
My fiance' was a paramedic for a long time. She lived for the blood-in-the-mud. She'd seen everything there is to see as well. The only things she ever had a hard time with was very old, young or mentally handicapped people. It was heartbreaking to her when someone, who just didn't understand what was happening to them, would be so hurt or scared.
Her worst moment, and probably one of the defining moments of her career that made her leave the job, was being first on scene to the Columbine shootings, and one of the first to enter the library. It was a horrible experience for her, to have seen so many children just shot, for no good reason.