Yes, refs spot the ball after very tackle. But, when the official determines the spot by forward progress, IT CANT BE CHALLENGED.
Let's try example:
First down marker is at 29.5:
Example A: RB makes contact with a scrum of defenders at the 30, they hold him up at the 30 with his feet churning, then 2 OLmen plow in and push RB down at 29, the ball is spotted at 30, no first down, he's ruled down by contact. The review shows that the players knee didn't hit until 291/2 and at that moment the ball was at 29. The spot of the ball is challenged ball is moved forward to the 29, 1st down.
Example B: RB makes contact with a scrum of defenders at the 30, they hold him up at 30 with his feet churning, then 2 OLmen plow in and push RB down at 29, the ball is spotted at 30, no first down, he's ruled down by forward progress. Coach sees replay of the knee hit at the 291/2, when ball was at 29 and challenges the spot.
It dont matter where the knee hit and it dont matter what the ball's most forward progress was as shown by the video.
THE SPOT OF THE BALL PRODUCED BY THE DOWNING OF A BALL CARRIER VIA A FORWARD PROGRESS DETERMINATION CANNOT BE REVIEWED! [The reason is listed in my previous post!-the replay doesn't tell us exactly when the play was blown dead, so we dont know were to put the ball].
Originally Posted by: Barfarn