Yi is able to cast Q and execute it while being rooted

Q makes yi unstoppable
Uploaded by TheGr8JellyOfDoom on 2019-05-05.
As the title says, he is rooted but still is able to q. I know he casted it just about when he was rooted, but as far as I know, you shouldn't be able to still be rewarded with an ability to execute if you don't time it well, especially if you're playing a champ as easy as Yi. Ahri ult while rooted? Impossible. Kayn Q or R while rooted? Impossible. Camille Ult while rooted? Impossible. Nocturne ult while rooted? Also, impossible. Why should Yi still be able to do this?
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