Lower Back Caning?
It’s possible we just have a bad camera angle, but it looks for all the world like this poor young lady is getting a painful caning on her lower back:
From Lupus.
See Also:
Spanking Blog: Adult Erotic Spanking At Its Best
 |  |  |  |  |
How It Started And How It's Going, The Movie:
Wild Party 2: Five Very Sorry Girls
"...thirty vicious cane strokes for each delinquent young woman caught drinking on school grounds..."
A rope, belt, or whip to the back is a classic painful punishment. Anything hard sounds dangerous on the back.