There is currently a bug with Nasus Q where regardless of the CC applied to him you can't stop his Q from hitting you even if you say use Fiddle fear on him while he walking up to you with Q activated and he will be feared but continue to hit you with his Q, this also happens to Fizz in his Playful Trickster as well which will stop his regular auto attacks but not his Q.
RiotRiot Exgeniar9 votesCC doesn't interrupt spell casts and attacks. The only way to stop an attack or spell casts is via Death. Thus Death is the best form of CC in our game.
Critkeeper4 votesthats not quite right.
cc stops attack and spell cast windup animations, but not the cast or actual attack animation.
if you cc someone right as they are winding up an attack, it will stop the attack, but if they successfully launch the attack (projectile is in the air, or melee champion is in mid swing), then nothing except death will stop it, whether it be a knock up, flash or whatever. If you've ever shot someone with a ranged auto attack but died before it hit the target, and it did no damage, thats what that is. Its the same with melee champions dying mid swing.
Some spells have an instant windup animation but a long ass cast animation, like ezreal ult.
But spells and attacks can be interrupted, the window for doing so is on the windup and is really tiny, so people assume its not there.
Auroramancer3 votes...the amount of times I've had my Blitzcrank/Nautilus auto attacks interrupted by CC.
This is not correct man.
GigglesO1 votes[{quoted}](name=Riot Exgeniar,realm=NA,application-id=LqLKtMpN,discussion-id=A6PxYwV9,comment-id=0001,timestamp=2016-02-29T04:00:53.823+0000)
CC doesn't interrupt spell casts and attacks. The only way to stop an attack or spell casts is via Death. Thus Death is the best form of CC in our game.
Things like vlad pool also don't make Nasus Q miss.
TheScav1 votesWhy does 
's q not work the same way when he is knocked up? The animation plays and everything but the hit isn't registered.
BlueBonquet2 votesSo when he was cc'd you could still hit you? was he moving to hit you or where you standing really close? Also when Nasus uses Q the effect will stay for a little in case that was what you misinterpreted.
pkplaya21 votesI did some testing on this with a friend and even Fiora's Riposte doesn't block it, that blocks EVERYTHING.