Rengar/Rapid Firecannon/Movement speed buggy interaction.

Rapid Firecannon give an extended range on a basic attack. Coupled with its 8% movement speed bonus, and Alacrity, Rengar can ult, then jump the same distance of the warning icon. Essentially, he gets a free cloak/jump on anyone that he may then use to root and destroy them at any time anywhere. Firecannon's interaction with Rengar's leap is silly. It seems like a bug that the indicator comes up when he jumps, so I'm reporting it in hopes that it will be fixed, bug or overpowered build.