Gragas's Drunken Rage and Titanic Hydra Active

If the active of Titanic Hydra is used immediately after Gragas auto attacks with his Drunken Rage (in order to get the auto-attack reset), and he immediately autos again with the reset internal cooldown, the next auto attack does not have an animation at all. However, it still does damage. It may or may not actually display the Titanic Hydra active animation, too - I'll have to check that out again.

It doesn't matter what Gragas is attacking, so long as it stays within his auto-attack range.