This is one not-so-lucky rider approaching a curve a little bit too fast and who instead of simply leaning the bike more, decides to brake. The bike engages into a highside and the rider tumbles onto and over the guardrail. This would be the “not-so..” part. The lucky part is that the rider wasn’t hurt and was even able to ride his Triumph naked motorcycle home.
Keep in mind that the bike goes towards the place you’re looking at and in this case it should have been the other end of the corner, not the edge of the precipice. Ride safe!