Opening the knees while you rotate.
Why it failsThe arm slides out through the gap and you finish holding nothing.
FixPinch the knees together the whole way through the rotation and the finish.
Lifting the hips before the arm is isolated and the thumb is up.
Why it failsThey rotate the elbow away, stack their weight over you, and pass.
FixSecure the wrist with the thumb up, glue the arm to your chest, then bridge.
Letting their head come up between your legs.
Why it failsWith their posture restored the arm straightens out and you lose the position.
FixKeep the far leg heavy across the back of their neck and pull down on the head or arm.