Artemis BJJ (MYGYM Bristol), Can Sönmez, Bristol, UK - 22/07/2016
Again, starting from a double sleeve grip with both feet on the hips, shift towards the leg which you want to de la Riva hook. Swing your same side leg around that for an initial de la Riva hook, bringing your instep to their inner thigh, releasing your same side sleeve grip in order to grab their heel. Pull the heel towards you, so they can't easily move their foot. Watch out for them kicking it across your buttcheeks: you want to keep that heel jammed against your body. If they are on their knees but have their front knee raised, push into their far hip and/or knee to make space for your hook
Shift a bit more to the side and raise your hips, turning towards them in order to extend that de la Riva hook all the way to the other thigh. This is what Dónal used to call the 'surfboard', due to the way you do a sort of plank with your lower body. When you've got your instep in place, solidly hooked around their thigh, bring your other foot lower on their leg, hooking around the other side. Your feet should now be forming an x, hence the 'x guard' part of this technique. Squeeze your knees and pull them in.
At this point, you can switch from grabbing the heel back to the sleeve. Using your knees and those sleeve grips, steer them in the direction your lower foot is pointing, in order to knock them to the ground. If they resist, you can go in the other direction, but this is weaker because it normally won't lead smoothly into a pass. As they fall, extend what was your bottom foot, maintaining the tension in order to push their leg away. Your other leg (which was de la Riva hooking) comes out for base. Turning as you follow them up, you'll generally end up in a sort of combat base, ready to pass.
Teaching Notes: More monkey tree drills, where Steve W came up with a slight variation. He's a powerful guy, so was able to use that muscle to support his weight from Aaron's arm. What I didn't realise until later is that it left a black mark on that arm from Steve's humongous grip strength! So not one to rely on, if impressive nevertheless. ;)