Single shot tether has never worked as the dev's have intended so I'm proposing a simple fix. Give tether WHICH IS A SUPER ABILITY the same ability to drain health as child of the old gods WHICH IS A WARLOCK CLASS ABILITY. I will even go as far as requiring an exotic armor piece to make this happen or accelerate the health drain. Call it "Draculas embrace" or some other horrible idea but you can't possibly think it's balanced to have a super move outclassed by a regular ability