I was at a BJ Penn seminar where he taught the technique of trapping one of the defender's arms with one of your hooks. He sets it up by reaching under the arm on one side and grabbing the guy's wrist on that side, then falling back on that side, starting to choke with the other arm. The bottom guy defends with his free arm, then you punch that arm down and trap it with your hook. Then BJ recommends freeing your hand and suffocating the guy with that hand while switching and falling back to that side to sink in the choke with the same arm. After the seminar, I went back and watched a couple of his fights and saw him set it up just like that.