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"If men get into a fight with one another, and the wife of one intervenes to rescue her husband from the grip of his opponent by reaching out and seizing his genitals, you shall cut off her hand; show no pity."
Not a great translation, but that doesn't matter. "you shall cut off her hand" means that she is to be fined.
Just like the Torah never commands anyone to poke someone's eye out, this section is frequently misunderstood.