Is this intentional or a bug? Although the 
didn't spellshield the 1st Zac Q (the skillshot), she was still dragged/displaced by the 2nd. She still said "Nice Try" and got the mana restore but it didn't prevent the CC.
Chibi Bronzlife1 votesOne, if she hits the shield after the skillshot connects, then it shouldn't block. I suspect what happened with the mana and audio cue was that zac or someone else attempted another ability after the pull in.
flyingbaklava1 votesApparently, Zac's second Q counts as an auto attack for all purposes except for the fact that it does not do his physical damage. It can be blocked by Jax counterstrike, pantheon passive, shen's blocking ability, and Teemos blind. I thought that was a bug, but Riot never responded when I pointed that out, so I imagine this must be intended as well. Makes no damn sense, but whatever, Zac's rework makes no sense at all so this is just par for the course.
C9 Squeeky 1 votesUpon looking up Sivir's Spellshield tooltip, it says it blocks the next enemy ability used on her...restoring mana upon a successful block of the ability. I am confused as to whether it blocked an ability because it didn't block anything at all lol. Guess you just gotta spellshield the skillshot part.
And yeah I agree about the Zac rework xD
flyingbaklava1 votesYeah, I guess that explains it as it does not appear that Zac's 2nd Q counts as an ability. Just curious, does Sivir shield block Gangplanks Q?
C9 Squeeky 1 votesI'm honestly not sure. I think it does? Idk what is coded as basic attack/on-hit or an ability haha
Shuyin1781 votesBecause you got hit by the 1st Q pre-spell shield, that doesn't make you immune to the CC from the 2nd Q because the 2nd Q doesn't hit you to trigger the pull effect. It's not like Morgana's Spell Shield that makes you CC immune which is why you can still be slowed in AOE zones if you walk into them.
MisterioM1 votesSame thing happened to me