Illoai's E blocked by black shield.

Morgana's black shield blocks Iloai's E but it doesn't make much sense to me. Black shield says it blocks cc, but Ianding Illoai e doesn't cc on hit, only if the spirit is taken. Is that deliberate or just a consequence of how they programmed Illoai E? i don't want to turn this into a yas thread but what is and isn't blocked by the windwall can be counter-intuitive.
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