spinning slash grants you something like 9 CS (~200 gold and equivalent experience) every time you spin through xerath's arcanopulse. idk of any other skills where the interaction is the same, but the particles for arcanopulse are treated as minions and riot got lazy with the coding so that's why that happened
bork hotfix later tonight
:happybrain:Riot said:"Razer’s launched a new League of Legends Collector’s Edition Naga Hex gaming mouse. Its six thumb buttons make it perfect for one-handed League of Legends gaming, and mean you’ll have a hand free to... admire awesome skins"
but the particles for arcanopulse are treated as minions and riot got lazy with the coding so that's why that happened