How were they caught?
They kept the incident a secret until the main offendor was drunk and blurted the story to his fiance (at that point very soon to be wife) and she was the one who called the cops, making the whole thing even more incredible.
I know this because the fiance is a close friend of a relation, so even with a pinch of salt it has some credibility.
At the time I suspected that the guy had been hit by a car because that road he was on is a bloody race track after dark with a mix of HGVs, tourists and locals smashing up and down the road without a jot being given. I’ve ridden chunks of that road in daylight, snowball in hell I’d do it at night. But that doesn’t excuse what they did at the time or after.