After the snap "A" 40 the back breaks through and makes a first down and the end of the run is the "A" 20. After the end of the run and the play, "A" draws a flag for USC. Are the chains moved and set with the LTG at the 10, and the penalty is marked off from the end of the run to the 35 with the LOS marker set at the 35, making it 1st and 25,
Or is the correct process to mark the penalty from the end of the run (20) to the 35 and then move the chains to set the LTG at the 25, making 1 and 10 from the 25?