Why does Fiora's W (Riposte) slow attack speed?

Genuine question, why does it slow attack speed? It already allows her to avoid ALL damage (outside of towers), it slows and it deals damage. So why does it slow attack speed?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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