This is likely to be what happened to me. I rode over helshoogte yesterday and 3 guys were standing around on the side of the road, just after Neil Ellis. As I got closer one guy ran at me and kept grabbing at my pocket, presumably to get my phone. I swatted his hand away a couple of times and stepped on the pedals. He chased for a while and then gave up. I stopped once I was about 50m away and stopped to look back. The other two guys that were with the original chaser said "He's just playing around" or something like that. Then they walked into the bushes. To be fair, it didn't look like it was part of their plan to chase me - it definitely wasn't some orchestrated attack and no weapons were involved. If only one of them had gotten in my way I wouldn't have been able to ride off to safety. But as haphazard as it was, I'm pretty sure the chaser would have taken my phone and/or wallet if he had gotten the upper hand. It's a busy road and while this had all happened a vehicle had slowed down on the other side of the road to see what was unfolding, as it was clear that I was trying to ride away from somebody. He drove off once I carried on pedaling uphill. I then remembered 2 riders behind me about 500m back, so I doubled back down the hill to ride with them past the same area and warn them of what had just happened. I'm guessing they then mentioned it on whatsapp groups and the news spread. Unless there was a more serious incident that I don't know about.
Anyway, for the record, this is what it was in my opinion: an opportunistic and disorganized attempt at theft by a seemingly unarmed tik-kop. Since the advent of whatsapp and other forms of social media, it's very hard to know if crime is increasing or just our ability to hear about crime that's gotten so much faster. Assuming the report you @Wannabe heard was what happened to me, you did perfectly well to call it "an unconfirmed report of a bikejacking", and it's the right thing to do to let people know/spread the word. But it's also very easy to see how one could see the words "bikejacking on helshoogte" from 5 different whatsapp groups and really have it put a negative spin on your day.
In truth I don't really know what to make of it. I ended up having a great ride to Franschoek and slept like a log last night, so clearly was not especially traumatized. But at the same time, the next time I ride past any dodgy looking guys and that little voice in my head that says "Just be careful here" that I've always silenced in that past and written off as paranoia... well it will no longer be silenced now, it's a really pity. 10 years of riding in stellenbosch and this is the first real "incident". I always ride solo and I think the fallout of this will be that I will ride in groups more, which I probably should be doing anyway.