User blog comment:Canvasofgrey/A New View on Supports v.1.1/@comment-96.30.138.69-20120421030049/@comment-3970297-20120422112743

My definiton between a Kill Lane to an offensive support is the overall goal throughout the laning phase. A Kill lane is purposely designed to kill the the bottom lane, farming gold through minions as well as champion kills, focused mostly to get those kills. This is a risker, more direct endeavor to win the lane, and proves to be very effective while also demoralizes the bottom lane.

An offensive support is merely meant to zone enemies out of minion range, slowly, but surely denying exp and gold to bottom lanes. The goal isn't to necessarily kill the bottom lane, while of course is nice when it happens, is not the purpose of the lane, thus taking less risks in tower diving or being at risk of jungle ganks. It's a slower, more agonizing advantage, but I feel it makes for a better game that way. After all, it's boring if the enemy just surrenders at 20.