You have given me a looped video that shows that someone made contact with the ball. The reverse angle replay in your video and all the others I've seen show that that person was Van Persie. It shows the spin of the ball changing as it leaves Van Persie's foot and remaining, as far as I can see, unchanged as Sagna's foot comes across Van Persie's leg. I might even have accepted you saying that Sagna's studs brushed the ball as he took out Van Persie's legs, but instead you've gone for the fiction that it is Sagna who knocks the ball on.
You can keep denying that all you want. Like I said, it's not exactly funny any more, but I can't imagine that being wrong would ever be enough for you to back down.