Horse Collar or Not?

[JRutledge]

The runner did not go backwards. He actually fell forward.

And for the record I have seen this play before as I personally know one of the official's involved and he sent me this play for my opinion.

Edit: I had some information incorrect. This was ruled a horse collar by our state, but it goes against what we were told in some interpretations. We were told if they runner did not go backwards, this was not a horse collar in all the literature that was sent to officials. This is not "classic" to me if the runner goes forward. But as said to me, "What do I know?"

Peace