"Ridley wanted Batty to be a sort of Bruce Lee; I did what I could. I didn't
want to push iron too much, so I went to stretching and that sort of thing.
But in preparing for a part, its more important to get your thoughts
together. The thoughts are always much more necessary to clarify than the
visual aspect of the body."
-Rutger Hauer

Batty breaks through the wall and pulls Deckard's hand and gun back through
it. On the other side, Batty slowly breaks two of Deckard's fingers.

Ridley Scott's storyboard of the painful scene.