--audible moaning/crying/etc. that is not just repetitious
i find this repetitious thing realistic.
i once heard a person dying after a car accident. Well, i was told later that he didn't die, he was saved in hospital or so i heard, but he went through the entire "dying" process in pain and fear until fainting and going comatose while trapped inside his car. Everybody there was trying to help him but nobody had the means to do so because the accident caused a severe traffic jam in what basically was a small road with small shoulders leading to a beach during high tourist season, and the emergency vehicles had problems to arrive. A shitty situation.
i was in the back seat of my parents' car and i couldn't see him but i could hear him. Initially he was obviously scared and in pain but he was keeping a "reasonable" if a bit confused conversation with the people around him including my parents, who were trying to encourage him while the emergency services arrived. He had obvious problems to breathe, don't know why, maybe he had broken his ribs or was just hyperventilating or just in a bad posture or something, but he was still able. He moaned a lot about his legs, he said that he couldn't bear the pain (that's how he was trapped, he had his legs crushed under something, i don't know what but that's what i heard, and that he was bleeding profusely.)
However, as the minutes passed and people called 112 (our 911) again and again only to be told that the ambulances and the firefighters truck with the "heavy equipment" to rescue trapped people were unable to arrive because of the jam, and that they had called a helicopter but wouldn't be immediately available because it was attending another emergency (remember the high tourist season?), the poor guy panicked as his state worsened. His speech became more confused and poor until he was no longer having a real conversation with anybody. He just moaned and moaned repeating how his legs hurt and something about his children as his speech went blurry and eventually unrecognizable but kind of "rhythmic" because it was so repetitive. As he "faded out", he pretty much sounded like a "cyclic moaning machine" until there was silence. All of this took, maybe, 20-30 minutes or so. The helicopter arrived like 10 minutes later maybe.
i have never heard another person "dying in pain and panic without medical assistance" (well, i have never heard another person in such a situation), so i don't know if this is representative or just a case among many. But because of it, i would actually expect repetitive crying / moaning in a crucified individual who is already in the process of "leaving."