possibly the person wore gloves but that just makes the loading difficult unless its a nylon or Ruber glove. either of those would have me thinking sabotage from a third party not a horrible accident.
A horrible accident is a safe being lifted by a crane and a sling breaks and it falls on a pedestrian, this is an azzhole cocking then pointing a loaded weapon and pulling the trigger at a person. That ain’t no accident. He didn’t check it, his fault, it might be involuntary, but it should be manslaughter.