Herzog actually teaches that move in his video blog episode 1. Around the 9 min mark he goes over it. Dope knee compression/calf-crank when opp. tries to roll out. Good shit!
Try this one...it shows the sub in slow motion. beautiful transition from failed heel hook to that triangle back take calf crush. I've only ever hit this a few times...very difficult...beautiful finish to a real tough no-gi move. Love oliveiras jitz game.