Make the clubhead pass your hands
You want to presereve as much speed as you can after the clubhead enters the sand. To do that, you should straighten your trail wrist and let your lead wrist cup as your left arm gives way and moves toward your side ( left ). This will let the clubhead sling past your hands. Notice I’m not twisting the handle like a screwdriver. It’s moving upward. I’m hitting the shot with a glancing blow. A good tee shot with a driver has a smash factor (ratio between ball speed and clubhead speed) of 1.5. In a good bunker shot, it actually will be less than 1.0, which means the clubhead is moving faster than the ball at impact. But trust me, that’s going to produce a bunker shot you’ll be proud of.