As I said, the GIF isn't really a good way to see the technique. I can see your concern as I could gpseymour's concern. This is easier to demonstrate while teaching than to try to describe I guess.
Think of it as pushing up under the front of the chin, also backward if you need to, but the lift of the chin tends to do that anyway. As the head rotates backward, if your fingers are too short, rotate your hand up and over the chin until your fingers can contact the eyes, then rake. If your palm rotates over the chin somewhat, no problem as you will still be pushing against the face/mouth, preventing the opponent from moving too much forward. Your movement and his resistance to having his neck broken should lead your fingers right into his eyes. There is no advantage to throwing the person if you rake the eyes. If he can't see, he will be no threat to you.