So your opponent opened your guard and stood up. How about making a grip on one sleeve and another on the end of their opposite pant leg? This is how Rafael Costa starts to transition to the x-guard. Note how he steps on the passer’s left leg, opening space to reposition himself. The guard player’s left leg momentarily wraps around the passer’s right leg. The right hand goes to the collar and unbalances your opponent. To conclude the sweep, Rafa uses the technical stand-up mechanic.
Above is the new video from Rafael’s X-guard course made available at the Gallerr YouTube channel. Below are the two older ones.