Battlecast Cho'Gath - Incorrect Sounds on Ultimate

Skin/Champion: Battlecast Cho'gath

Bug: When using the ultimate, the sound made is of the normal Cho'gath skin, rather than the special Battlecast sound.

Replicability: 100% of time ultimate was used, regardless of target.

I seem to recall people mentioning hearing both the legendary and normal ult sounds for the gentleman cho'gath skin, but in this case i only heard the vanilla cho'gath ult sounds.