How many people used tickling and laughing to extract confessions during World War II?

In this way, the Nazis tortured Jews and female spies, fixed women and scratched their armpits, navel and soles to extract confessions. Henghei witnessed the whole process of the prisoner's punishment and wrote a book. Some people witnessed the punished women from the beginning to grin, laugh loudly, struggle to twist their bodies and roll their toes. Then I sobbed, laughed, cried, even suffered from lack of oxygen, incontinence and unconsciousness, constantly begging for mercy, and finally repented. Laughing is a great pleasure for executioners. What's more, after the woman confessed, she continued to tickle the soles of her feet, watching her struggle for mercy and giving herself psychological and physical satisfaction.