My ult *didn't* go off? (Skip to 20 seconds in)

Sorry for poor video quality but this is taking too long. So Akali shroud cancels abilities? The video CLEARLY shows my ult went off, completely. Yet it doesn't go off cooldown and the damage doesn't apply. {{champion:498}} can still be hit in her ult if you target her BEFORE she ults, so why would Akali shroud cancel my abilities if I target her before she shrouds? Im seriously confused.
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