Rolling Knee Bar

I love hitting leg locks. The first submission that I taught myself, was the rolling knee bar. I was just a white belt and I was getting my butt handed to me from a blue belt. I was in the turtle position and the blue belt was attacking. I trap his leg from the turtle and hit a forward roll. He rolled and his leg was in front of me. I just went for it without know what I was doing. He yelled out and that how I learn the rolling knee bar. The knee bar is a submission that only advance grapplers can use.