Artemis BJJ (MYGYM Bristol), Can Sönmez, Bristol, UK - 26/02/2016
From the top of half guard, there's a cool attack sequence I learned from Jason Scully's Grapplers Guide. Establish a strong cross face and solidify your base. When you're feeling secure, yank out their far lapel, getting as much material as you can. Pull that over their far arm, trapping their wrist to their shoulder. Feed the lapel to your cross-facing hand, gripping as near their wrist as you can. Use your head to press their arm to the floor.
From here, you can continue to twist on their lapel, going for the submission. If you need extra leverage, switch the lapel back to your other hand and continue rotating. If that's still not enough leverage, you can always transition into a standard americana. Your head control on their wrist should help you set up the typical grips on the wrist and finish the lock as normal. If you keep their wrist trapped with the lapel, you can do the normal americana, but with the added bonus that they can't unbend their arm due to the lapel. If they free their arm, you can switch to a choke, much like the ezequiel, but using the lapel to lock it in.
Teaching Notes: I'm not sure I need to go through quite as many endings on this (you can apply with a twist of the gi, bring your arm over and twist, or use it to lock in the normal americana), but seemed good and straightforward. Use of the head is worth emphasising, as well as the usual stuff about not picking the whole arm up off the ground (as that relieves the tension on their shoulder).