I doubt there would be anything made of this, just watched it and to be honest in full speed, it's hard to see, you just see Sinfield Grimace in pain, give Moore a look and Moore does not have a clue.
When you watch it then frame by frame, Moore is ontop of Sinfield as he gets the ball. Almost the next frame his arms are wrapped around Sinfields arms and the ball trapping it. Sinfield strains forward, Moore has one foot on the ground and the other still on the move from the momentum of the tackle. Moore plants both feet on the ground, he does not wrap them or cross them around Sinfield's legs. Roby comes in to tackle on the other side and Sinfields legs bend in an un-natural way against Moores hip/groin area.
Nothing in it at all that was intensional or milicious. Just a good ball and all tackle with 2 men in that when wrong, there was no tightening of legs or arms to apply pressure after or during the tackle. It was just a bad fall.