Hecarim ultimate vs Yasuo

I've been playing a lot of Hecarim lately and I've had this issue against Yasuo at least 3 times, every time I ult him while he is dashing with his E, literally nothing happens. He doesn't take damage, and he doesn't get feared (and no, I didn't 'miss' my ult). I don't know if it is intended or not but it feels very much like a bug, and it's annoying. Anyone else had this happen to them?
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