Now you're getting it!
Although I've described it as 'Kill Team with Level Ups'.
I can see that I've badly misrepresented Hurl Opponent, mostly because I don't have the rulebook and I wont have it for another two weeks, and I'm going off of information I've (badly) scribbled down from the store's rulebook. Looking up a actually, I can finally see how Hurl Opponent works, and it works like I wanted to; Hurl Opponent is used instead of making a To Wound roll, not Injury roll, which makes it far more useful. But still not good.
Unless you're throwing them down a drop, it's a complete waste of time. And unless you're throwing them off a 10" drop, it's not even good.
Even then, it's still the worst Skill in the Muscle tree and will remain how I left it.