While each game varies in scope, games like Soul Calibur (especially in 3 and 4) have AI that reads the buttons you push to react.
Oh man I forgot about that series having that terrible habit. Sometimes I felt like I was controlling when the AI parried, not when I attacked >__>
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"Duel audio? You mean like rap battles?" - termina_rzident
KrahenProphet and Kana are on opposite ends of the Awesome Spectrum.