If Illaoi is cced during her W jump animation, the attack is cancelled and she cannot jump again and the skill goes on cooldown. The attack should either go through regardless of distance (not ideal) or she should be able to jump again after the cc wears off.
MujinTengu1 votesTristana jump animation stops when she gets Stunned, rooted or displaced, She has a much higher cooldown and her jump is her escape as she is an adc, If Tristana doesn't get it, Illaoi should not get it either (Unless her skill states she is unstoppable during her W's animation
The Nagakabouros1 votesThat is something completely different. Tristana's is a long range jump, illaoi's is an empowered basic attack. If you are in jax's W animation and get stunned, it doesn't just disappear, the buff stays until ur not cced anymore.