Artemis BJJ (MYGYM Bristol), Can Sönmez, Bristol, UK - 10/03/2017
Today I looked at some attacks from high mount, where you've gotten up right by their head. The first option I like to try is fishing out an arm and doing an americana against the leg (though the distinction between americana and kimura gets a bit blurred). Your knees are by their ears, squeezing in tight, causing their arms to cross over their face. For this attack, you need to be able to thread your arm by their crook of their elbow.
Grab their wrist with your other arm, using your initial arm to grip your own wrist (same configuration as if you were doing a kimura from north-south). Making sure your knees are squeezing in tight, bend their arm against your leg for the submission. Be sure to use the turn of your body, rather than purely your arms: you'll get more leverage that way.
If they have managed to hide their arm, swing your torso around so that your ribs are pressing against their forearm. That wedge means you can now walk sideways on your toes to roll them and take the back. You could go all the way until they end up flat on their belly, for what is arguably the most dominant position in BJJ, full back mount. However, if you do that, I'd recommend getting an arm under their neck before you fully roll them over, as it can be irritating to dig your hand in once they are completely flat (after all, there is a reason judoka treat that paradoxically as a defensive position, used to stall for a few seconds in competition so they get stood back up).
My preference is to instead walk them just far enough to get them up on their side. From there, I can then move into technical mount. That then provides lots of options, with chokes, armbars and a back take all available.
Teaching Notes: I tend to call this an americana, but I'm wondering if kimura would be more accurate? Or maybe just figure-four. Either way, I could talk more about the specific grip, making sure people know which arm goes where (that's something I noticed when talking people through it on the following Tuesday at open mat). Also, the body position on the back take sometimes confuses people. I dispensed with the full rolling them over thing to just go with the gift wrap instead, as I think that's easier to understand. It's also always going to be available as long as you keep their arm jammed so they can't pull it back.