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Atemi’ is a term in Japanese martial arts that describes a defensive blow used to neutralize the ki of your partner, ie, put him/her off balance so a technique can be effectively applied. It is not meant to inflict injury, but can result in an instant knockout.

The are 9 scenes in this video where Lillian KO Valerie with atemi in different ways and 9 scenes where Valerie KO Lillian with atemi in different ways.