Thronebreaker Chee'ilth with Kate Bishop???

So I saw that Kate Bishop would be a viable option said great I like when a champ I like using is viable, got to boss, went in and seemed like it was ok, until Chee'ilth parried my repost arrow how does that even work???
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Also don't try to do combos on her
No real idea though, we cant see how it's working under the hood so all we can do is speculate