Singed needs one thing to make himself jungle-capable: Mana refund when using Fling on monsters

Ever since Singed's Fling was changed to deal a % of the target's maximum health, he's become SOMEWHAT jungle capable. There's just one problem with it: 100 mana cost on Fling. If you don't have a Blue Buff, Singed can't jungle.

To reduce his dependence on Blue Buffs, Fling should refund at least half of its mana cost if you use it on a jungle monster.