I was able to switch back and forth fairly easily, He almost does it for you, as the angle for them is opposite. That farside underhook is very important to keeping the shoulder lock angle on certain body types. Tiny guys can out pommel you there and the big guys pressure, in either of which kinda hand you the duda. If they angle away and "unstack" their shoulder from on top of their own wrist (duda angle) then untraingle the legs and angle back under the for shoulder lock. Cool thing is i dont know if the guard has got passed once trying this stuff. The angle for him to pass is the angle needed for the sub. You would hafta pass over the foot-on-hip side I guess. It seemed easier to get than the duda, but im no expert, especially on the duda. But the deep hook arm doesnt need to be in his elbow very deep to do the shoulder lock. Again, I wanna analyze it much more before I got off saying its wonderful and reliable.