New Skin: Cheetah Rengar

So, with Rengar's rework making him all ROCKET CAT GO ZOOM, I thought it would be time to bring out a new skin for our favorite "stabtabby": CHEETAH RENGAR! The skin would bring out a lither version of the hunter, perhaps something like the idea below, courtesy of SlinkyOnion on DeviantArt.

The primary problem, however, is the fact that cheetahs cannot roar: http://en.wikipedia.org/wiki/Cheetah

So, what would Cheetah Rengar's battle roar be?