Not really surprising, drifting is for crazy people.
Drifting is, by its very nature, a dangerous thing. The whole idea is to lose just the right amount of control of your car, and walking that tightrope is far too difficult for most people. So when you put a bunch of cars on the same track with the idea that all of them are going to be drifting around the corners in quick succession, there’s a pretty good chance that it could go wrong, which indeed it does in the following video.
The event was the World Time Attack, and this happened during practice. Something a few drivers clearly could have used a bit more of.