Sam-il Twisting Kick
Mr Mark Trotter explains to Melissa Timperley that by turning the supporting foot outwards slightly, it enables the hips to open into a better position to be able to perform a better twisting kick. They also work on getting good balance after the kick, rather than just falling into the next movement.
This clip is part of a casual coaching session full of useful hints and tips on not only this pattern, but technical performance in general.