Sounds like there has been an offensive live ball foul during a loose ball play, which calls for previous spot enforcement. As stated, accepting the foul will result in a 10 yard penalty and repeating 4th down (4th -20), clock would start on the RFP.
If R1 runs,for more than 10yards or fumbles OOB the foul remains exactly the same, but the result of the options (depending on where the ball went OOB) changes. If, after an OOB fumble, R, having been in possession after the COP, chose to decline the penalty and put the ball in play at the OOB spot, the clock would start on the snap. (1st down after a kick).