I never encountered this and at least the girls in my school never showed the same deviant pleasure that I took from knowing others were faced with their own doom when in trouble. Some of the girls would actually show sympathy for a classmate who had been whacked. I
The only time a girl saw me get the slipper happened in the back garden, she was watching from next door. When it was over I looked at her hoping she would feel sorry but she had a big grin so I just ran into the house feeling angry and disappointed.