If I understood Unohana's internal monologue correctly, it was more a habit he got into because when he fought her the first time, he was so happy to find a worthy opponent he became scared that if he killed her he would never find anyone like her again. This whole fight was a kind of therapy to reset him to the way he used to be.
Anyway, it seems to mostly be something he does with higher level opponents like Ichigo and Nnoitra. Sometimes he does really murder his opponent full stop, like in the case of Giriko.



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