When executing lasso guard to omoplata crucifix, the opponent may be able to slip their arm out of the omoplata. If they do this, they will very likely move immediately to the top position.
Hopefully, you will have one of the grips set up. Anticipating the opponent coming up, tori bridges uke through, forcing them to turtle. The grip for choking will be wrong, so tori will have to keep their weight across uke’s back, making uke carry tori’s weight on their hands/elbows. From here, tori can move to the opposite side of turtle, setting up the grip to enter a variety of clock chokes.