Matt Kwan showing the most popular crab ride back take (from https://www.grapplearts.com/modern-jiu-jitsu-berimbolos-crab-rides-and-rolling-back-takes/) – this from the modern, ‘new school’ method of jiu-jitsu which focusses on using innovative and unexpected techniques to take the back and submit your opponent! The leg drag (and the roll to the back) is used extensively by top BJJ competitors like Rafa Mendes and Gianni Grippo.