This video is obviously NOT what one wants when depicting a nail being hammered through the palm* of someone's hands. Obviously the crucifier should not be able to casually push a nail into the palm of the victim's hand as if it were made of putty, then take her hand away before using a hammer on the nail.

I tried to make this very clear with my prompt:

Pam is a naked woman tied down at her wrists and ankles to a wooden cross on the ground. Pam CANNOT MOVE HER HANDS. PAM CANNOT MOVE HER FEET. She can only squirm helplessly.

Mary is the woman holding the nail.

Pam's arm repeatedly tugs against the ropes, but her struggle against the ropes is futile.

Treat Pam's hand and the palm of her hand as if they are as tough as wood. Mary CANNOT simply push the nail through Pam's hand.

While keeping a hold on the nail Mary hammers the nail through the palm of Pam's hand and into the wood below.

Some blood trickles from Pam's palm where the nail has punctured it. About 3cm of nail is left protruding.

Mary KEEPS HOLDING the nail until the nail has been hammered firmly into place.

Finally, Mary withdraws the hammer and her hand.

I kept wondering where in the world the AI would have learned that hammering a nail works anything like the video clips it kept producing.

One wrong idea I had was maybe the AI didn't realize, since there was only one crucifier's hand in the starter image, that the crucifier had another hand available to do the hammering, so it was trying to make one hand do the work of two.

That thought, however, didn't solve the problem.

My next thought was the key to the solution. I realized that the started image that I created showed the nail being held in a woman's right hand. Apparently the way the AI was trained it just couldn't "imagine" a right hand holding a nail and a left hand doing the hammering.

No matter how I pleaded with my prompt wording, wielding a hammer using a left hand was almost inconceivable to Wan 2.2.

The solution? Just mirror-image my starter image, turning the right hand holding the nail into a left hand holding the nail.

Immediate satisfaction. The nailing was finally done correctly (shown in a reply post).

*Yes, yes, I know in real life the wrist would work better for holding someone up. I think the palm of the hand is sexier, however, so deal with it.