Why does light travel backwards in this experiment?

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I am unsure if this belongs here, but Einstein is talked about in the article and a bit of relativity is mentioned.

http://www.rochester.edu/news/show.php?id=2544

I do not at all understand the explanation given in the article for why this happenes the way it does, can anyone give a simplier recount?
 
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Thanks, clj4! That makes a lot more sence. :smile:
 

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