Blade Waltz misses when you're blinded.
Originally Posted by Agent109
Blade Waltz does not miss when Fiora is blinded because, quote:
"Fiora dashes around the battlefield—becoming untargetable in the process—damaging random enemy champion(s) 5 times. Successive hits against the same target deal 25% damage. The first and last attack will be against the same target. Each strike applies on-hit effects."
On hit effects don't require needing not to be blinded to deal damage, get you facts right or just test them out.
You still channel the ability, it just doesn't do any damage.
Any ability that masquerades as an auto-attack (the ones that apply on-hit effects) are all subject to blinds, thornmail damage, warden's mail and radnuin's omen slows, ninja tabi reductions, doran's shield damage block, and anything else that applies to auto-attacks. Getting exhausted when you started channeling Blade Waltz in season 2 was incredibly broken, as you'd reduce the damage of Blade Waltz by 70%. Things like Counter-Strike, Riposte, and Pantheon's Shield also block Blade Waltz damage.
I'm not just saying this because I've read it somewhere either, I actually main Fiora when I play Dominion, and have experienced all of that first-hand.
You should get your facts right and test them out >: )