Metaphor for the Medicare "cuts"

Paul Ryan got lots of rave reviews for this discussion of alleged "double counting" in the pay-fors for Obamacare, including the now-famous $716 billion (estimated at the time at more like $500 billion) in Medicare "cuts" he and Romney have been attacking Obama over.  The basis for their attack is that Obama's math supposedly counts the $716 billion as both extending the life of Medicare and also paying for part of Obamacare, and it can't do both, therefore Obamacare will add to the deficit.  Here's an article with a fantastic metaphor that illustrates how the situation isn't actually double counting.