Sivir Spell Shield Doesn't Block Anivia Stun
Not sure if this is intended or not, but when Anivia uses Q (Flash Frost) on Sivir, if Sivir activates her Spell Shield before the ice ball hits her, the spell shield gets popped but Sivir still gets stunned and still suffers double damage from Anivia's E (Frostbite).
Maybe the spell shield is blocking the first part of Anivia's Q (the magic damage), but not the second part (the stun)?
As a Sivir player, it is annoying to play against.