Tristana's rocket jump and Veigar's wall of doom
If she can jump anivia's ice wall she should be able to jump veigar's wall. How come she can't get through that thing?

If she can jump anivia's ice wall she should be able to jump veigar's wall. How come she can't get through that thing?

Veigar E stuns and knocks down, Anivia wall does neither
There is no height dimension in league. Even if something appears to be a jump, it’s still coded as a dash. Since Veigar’s cage blocks dashes, it will stop the jump.