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Aref Karimi/AFP/Getty Images

Afghanistan commandos guard four black-clad Taliban fighters in Herat

We’ve had months of depressing news about so-called “green-on-blue” killings in Afghanistan – where Afghan troops kill their purported allies, American and otherwise. Such perfidy has accounted for about a quarter of the 63 U.S. deaths there in 2012. It’s a change, then, to read about what Afghan social-media users have begun calling “black-on-black” killings – one Taliban dispatching another with extreme prejudice – so-called because of their usual garb.