This Fiora pick mid works really good against champions with one good knockup or stun that leads to their big amount of damage like Yasuo, Ekko and Fizz. The reason Fiora works good here is because she can W counter it, and after she does it she have all odds to win the trade. I especially recomennd to learn this guide and follow it if you are a Katarina main, since Yasuo, Ekko or Fizz can be bad matchups for Katarina.

When you see that the enemie laner walks in a range where you can walk up a bit and Q him, you should Q AUTO E,E and then you are out and win the trade.