The point behind PSK is that the down is going to take place under the idea that the kicking team is giving the ball up, and they will unless R fouls horribly at the line. This year the criteria has been simplified: any foul by R that is downfield will still result in them keeping the ball. PSK enforcement starts with the snap (rather than when the ball clears the neutral zone expanded). Any foul downfield by R will be enforced from the end of the kick, or further back if the foul occurred behind the end of the kick.
I may have over-simplified it, but I think I hit the basic ideas of PSK. If it's your first year doing football, don't worry too much, just figure out what you should watch for on a punt and do that. Let your referee figure out the rest. ;o)
-Craig
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