In this video I demonstrate how movements 17-19 from Bassai Dai can be used as a defence from a single leg takedown attempt. This drill is not my creation. I learned it in a BJJ gym I used to attend. The movements clearly fit the movements from Bassai Dai. First, use the shuto uke to make space between your *opponent's head and your chest (movement 17). Next get a grip on both arms (movement 18). Finally, pull the arms to your chest and kick down just like the kata (movement 19). I hope you enjoy this video.
I used the term *opponent because I see this more as a fighting application tham one meant for self preservation.