Why can fizz jump over event horizon but jax can't?

Fizz becomes untargetable when he jumps with e. Jax does not.

If Fizz Q's through then he'd get stunned.

Fizz is untargetable during E, so he cannot get stun. Jax is.

Try to use Q as Fizz through horizon, u'll be disappointed.

WHITE MEN CAN'T JUMP, FOOL.

Aatrox gets stunned too

Think about it like this. Terrain is not coded in the way you would think it would be IRL, that's why champs like ( random champs ) can literally dash through what amounts to a large mountain ( walls ), while some can also jump over it like and . Veigar's event horizon is not coded the same way, it CC's any champion that goes over or through it, in the same manner ult does just without the knockback.

has a built in stasis to his E. During stasis, one of the benefits is you cannot be CCed. Therefore, since he can still move/dash while his E is active, he gets through the wall.

Also, saying that " Jax jumps over it " doesn't make sense, you don't know exactly how tall veigar E is or how high jax can jump, what you see from your PoV is not always the exact coding.

Welcome to Riot and their coding. Jumps show visually going up but the code is just moving you in a straight line. Everyone else has pointed out that Fizz is not counted as being there during his E so it works more like a blink (Flash etc) and not a dash.