Reaching down and hugging your own leg stalemates the choke but it leaves you vulnerable to an armbar or a kimura.
The other commonly used defense is to "answer the phone" with your trapped arm. This creates space and usually prevents your opponent from finishing the choke. Couture escaped an arm triangle from Big Nog this way. This is usually what I do, and I wait for my opponent to burn out his arm strength and give up the choke. But to get out of it, I think you either have to work your arm back under your opponent's head, or you have to roll in the other direction and get to your knees before the choke gets too tight.
There's also a way to escape it by bridging and rolling your opponent over you, but that shit would not work on Brock Lesnar.
The arm triangle is really a great choke because the escapes all basically suck. You really just have to not let him get your head and arm trapped in the first place.
IMO, the phone defense works well until he starts to cut the angle, then it fails. When Randy did it against Nog, Nog was in in half guard IIRC. He never got to mount, dismount, and start creeping up to get the angle. If it is really tight, you will still get tapped with the phone defense.
Lets not get to far away from the fact that Lesnar used pretty damn good technique to get that sub. He passed to mount, with the head already in position, took the time in mount to "sinch" it up and then dismounted, applied, dropped his hips and when he couldn't get the finish, instead of staying there and muscling it he walked his hips out toward Carwin's head.
Not bad imo.
Actually, yeah, I would've grabbed my left foot with my trapped arm as a last ditch attempt to survive. (I think that's what you're saying, sort of?)
But, more than likely, against someone as strong as Lesnar, I would just look like an idiot holding my own damn foot as I pass out.
Lets not get to far away from the fact that Lesnar used pretty damn good technique to get that sub. He passed to mount, with the head already in position, took the time in mount to "sinch" it up and then dismounted, applied, dropped his hips and when he couldn't get the finish, instead of staying there and muscling it he walked his hips out toward Carwin's head.
Not bad imo.
I always wrap my inside leg, and teeter-totter to escape. If they're holding on tight, they'll allow you to reverse every time.
Edit: From this same position with the leg wrapped, you can do a back roll to escape as well.
This is very similar to a traditional headlock escape. Usually a sit out and lifting of the head hampers that strategy. It is one of those situations where you get the position early or you dont get it at all.