[O.B.Left]

Right wrist bend can be "fixed" but elbow bend can not. As a drill let your left arm hang below your shoulder then use your right hand to grab your left wrist. You will notice that your right wrist is bent. Now use your right arm to lift and lower your left arm "back, up, and in" across your chest. You will notice that your right wrist is fixed but your elbow will bend to top then straighten to follow through. This is the "magic of the right forearm".

Freezing the elbow is not advised for full motion shots.

Exactly. No bending right elbow, no Magic.