Street Jiu-Jitsu vs. Sport Jiu-Jitsu

They make a lot of great points. This video is definitely worth a watch. This is probably one of the reasons a professional fighter like Frank Mir tends to get pounded out whenever someone on top of him punches him. It's like he doesn't know how to react to it or deal with it and he comes from a sport Jiu-Jitsu background.