R6 Rider Spills the Silly Way [Video]
We can tell almost for sure that the R6 rider wasn't even paying enough attention to his fellow in front of him. Instead, he gripped the front brake, locked the wheel and irremediably lost control of the bike.
Even at such a short distance, better braking skills with a firm grip and a little rear brake could have saved the day. In fact, being able to brake firmly yet without being brutal is one of the key elements of emergency braking.
For more on how to brake safely in various scenarios, you can check out these Autoevolution guides.