Gracie Barra Bristol, (BJJ), Can Sönmez, Bristol, UK - 08/10/2013
I started off with the simple, instinctual option, recovering mount from the back. They've cleared one hook and managed to put their shoulders onto the mat. It will be tough to regain your back mount from here, especially if they've moved over your leg. As soon as you feel their bum move past your knee, bring your remaining hook over their body and clamp the heel to their far hip. Make sure it is providing you with enough control that they can't simply shrug you off. Pull out your elbow for base, then turn and slide through into mount, using your heel for leverage.
If you can catch them before they get their shoulders to the mat, then you can retake the back. They manage to clear one of your hooks and start bringing their hips over. Before they can get their shoulders to the mat, press your chest into their shoulder and roll them onto their side, in the direction they were escaping. You'll probably need to balance on your shoulder and head to get into the right position. As they have cleared one of your legs, you should be able to then slide that knee behind their head (you might need to post on an arm, but see if you can do it without releasing your seatbelt grip). Sit back and roll them over your knee, then re-establish your second hook (note that in sparring, this will almost certainly be blocked, but that's for another class). You can keep doing that from side to side as a drill.
Teaching & Sparring Notes: This is another lesson which is feeling relatively solid, probably because the techniques are quite basic: I switched the order from the last time I taught this, which I think works better. In terms of improving for next time, I felt I was babbling a bit when teaching, so I want to be more succinct in future. Arnaud asked a good question in regards to the second technique, as he said he's had trouble in the past stopping them slipping down.
I was pleased my answer seemed to help, which in short was to make sure you're hooking under their arm, which then acts as a block. It also made me wonder if it matters which arm grip is better when you're going for the back retake. Under the arm means they can't slip down, as per Arnaud's question, but there is a chance your arm might get stuck. I prefer going under the arm and using what was the choking arm for base, then regripping for the turn, but it's something to experiment with. It may also be the case that it is a matter of preference.
Sparring with Tony, I continued to play with the one-on-two grip when defending the back (by which I mean clamping their arm that's by my armpit, using that same arm to grab their opposite sleeve: I started using it last month). That frees my other arm to grab their leg and stiff arm into it, ideally meaning I create a continuous space they can't fill back in before my escape. It worked the first few times, but Tony later worked out a few ways of scuppering what I was doing (especially as we were discussing it each time: he was doing some kind of judo grip, yoko something something?). Which is great, as that should hopefully mean my defence will improve as I iron out all the kinks. :D