To the original question...possession doesn't change on a scrimmage kick until (and unless) team R gains possession by catching or recovering the kick. The principle behind PSK is that by kicking the ball, K has shown their intention to give up the ball. But throughout the duration of the kick, Team K is still in legal possession. If they weren't, how would you enforce the penalty for an R foul during the kick that isn't subject to PSK, e.g. a foul by R on the LOS? PSK is just an exception to the fundamental Ed mentioned in his post where the team in possession at the time of the foul does not retain possession after enforcement. Don't confuse PSK situations with a change to the definition of team possession. That definition has not changed.
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Bob M.
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