I think what indy's communicating is that Panda causes your content to lose authority. With the loss of authority comes a loss of it's ability to outrank those that copied your content. Which makes sense.
Sure as hell doesn't make sense to me, this is almost an oxymoron.
One has written an article and were ranked at #1 however someone has scraped it, served it up as their own and then the original is de-ranked since it is not the authority since NOW the scraper is...bunkum Google, if this is what you are, in fact, doing, then the sooner you're freakin' toast the better.
This begs a far, far bigger question though.
Google de-ranks a formerly authority site/article and awards the origin to the scraper...just why are Bing/DDG/Yandex/Grobe/Zapmeta and Baidu getting it correct and Google not?