The iron law of competence and context: of the most commonly asked questions I receive runs like this, “I love what the squad does in grappling competitions with leg locks, but would those leg locks work in MMA?” There seems to be an odd conception among many people that leg locks are somehow DIFFERENT from all other grappling insofar as they are workable in grappling, but unworkable in fighting. I never hear people say for example, That arm-bars work in grappling but don’t work in MMA, or Darce strangles, or passes etc etc. Here is a point so important it ought to be written in large bold letters on the wall of every jiu jitsu academy in the world – THE COMBAT EFFECTIVENESS OF ALL THE MAIN MOVES OF JIU JITSU, INCLUDING LEG LOCKS, IS NEVER DETERMINED BY THE MOVES THEMSELVES- THEY ALL WORK WELL – BUT RATHER BY THE COMPETENCE AND CONTEXT IN WHICH THEY ARE EXECUTED. The is, ANY jiu jitsu move can result in catastrophic failure if applied incompetently or at the wrong time or on the wrong person. This is just as true of arm bars and strangles as it is of leg locks. Worry less about your technique selection and worry more about your technique execution – do you perform it well? Do you select it at the appropriate time and against an appropriate opponent? Do you make the necessary adjustments to lessen the danger of striking technique being used as you apply it? Do you have a realistic follow up if it should begin to fail? These are the more important questions. Here, Outstanding MMA Joao Zeferino, who has trained regularly with the squad for a long time, great execution of heel hooks in MMA at WSOF lightweight Grand Prix in 2015, submitting to two opponents in night, including MMA legend, Jorge “Macaco” Patino with fine technique well adapted for the different pressures of the cage