FWIW, unusual events do occur - for example, this woman got hit by a space rock:
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I remember reading about another incident, years ago, that stuck in my memory because I owned the same type of firearm involved. There was a woman driving down a road back east, near a body of water (Long Island Sound?). She had one of the back windows in her car rolled down an inch or two; while she was driving, a bullet came through that tiny opening and killed her. The police assumed it was a sniper, and because the victim had no obvious enemies, they assumed it was a criminal firing at random vehicles. Unable to locate any evidence (shell casings, etc.) near the crime scene, the police started knocking on doors in the vicinity, and asking if anyone had seen or heard anything unusual.
Early in that process, they spoke with a resident who had been out on his boat the day of the shooting. He told officers that he kept a surplus Lee-Enfield on his boat, and while out that day, he had popped off one .303 round, aimed down at the water, to verify that the ammunition hadn't become inert due to age and moisture. Apparently the projectile that killed the driver matched the boat owner's ammunition.
The odds of a single rifle round fired from a boat on the water, actually hitting a moving vehicle at long range (whether aimed or not) were exceedingly small. Furthermore, the distance was so great that the bullet would probably have failed to enter the vehicle, if the car window was closed. And the angle and timing had to be exactly right, for the bullet to actually strike the driver inside the vehicle. What were the odds? Who knows, but I doubt that the result could be reproduced, no matter how much time, effort, and money you threw at it.
Sometimes, very unlikely events (like winning the lotto, or getting killed by a ricochet fired a mile away ;^) do occur. I'm not saying the fighter got hit by a space rock, but it certainly isn't impossible...