See, it was a simple mistake that anyone could have made. And as soon as* they realized that, they dropped the charges.
*six months after
Seriously, though... Their excuse for letting him go isn't "It's ridiculous to prosecute someone for an insult," but rather, "We can't prove that he committed a crime?" Not, "We welcome the free and open exchange of ideas," but "Some people (foreign heads-of-state) are more equal than others when it comes to being insulted, but we'll let you get away with it this time?"
This has completely gasted my flabber.