Battle Cast prime Cho'Gath

I realized while recently playing Cho'Gath with the Battle cast prime Skin his E activation and somewhat sound animation doesn't't sound like the rockets or missiles this skin used to have. When activating his E his arms glow purple with the aura coming off of them as if its still resonating from his purple base skin now I personally wouldn't 't call this a huge Bug but it is irritating to know it doesn't 't sound like missiles while the arms have the aura of purple also. I would change it personally to make the E sound and display more based off of the description of his Skin. His W for some reason when hitting the enemy a little bulb inside the enemy champion looks purple and his ultimate no longer sounds like a grinder why is that? I'd love the skin more if there was a fix